Mojave Desert

Template:Short description Template:Use mdy dates Template:Use American English Template:Infobox ecoregion The Mojave Desert (Template:IPAc-en;Template:RefnTemplate:Refn<ref>Template:Cite OED</ref> Template:Langx;<ref>Munro, P., et al. A Mojave Dictionary. Los Angeles: UCLA, 1992</ref> Template:Langx) is a desert in the rain shadow of the southern Sierra Nevada mountains and Transverse Ranges in the Southwestern United States.<ref>Template:Cite web</ref><ref name=":0"/> Named after the indigenous Mohave people, it is located primarily in southeastern California and southwestern Nevada, with small portions extending into Arizona and Utah.<ref name=":1">Template:Cite encyclopedia</ref><ref name=":0" />

The Mojave Desert, together with the Sonoran, Chihuahuan, and Great Basin deserts, form a larger North American desert. Of these, the Mojave is the smallest and driest. It displays typical basin and range topography, generally having a pattern of a series of parallel mountain ranges and valleys. It is also the site of Death Valley, which is the lowest elevation in North America. The Mojave Desert is often colloquially called the "high desert", as most of it lies between Template:Convert. It supports a diversity of flora and fauna.

The Template:Cvt desert supports a number of human activities, including recreation, ranching, and military training.<ref name=":2"/> The Mojave Desert also contains various silver, tungsten, iron and gold deposits.<ref name=Dibblee/>Template:Rp

The spelling Mojave originates from the Spanish language, while the spelling Mohave comes from modern English. Both are used today, although the Mojave Tribal Nation officially uses the spelling Mojave, which is a shortened form of Template:Lang, an endonym in their native language, meaning "beside the water".<ref>Template:Cite web</ref>

Geography

The Joshua tree (Yucca brevifolia) is endemic to the Mojave Desert.<ref>Template:Cite web</ref>

The Mojave Desert is a desert bordered to the west by the Sierra Nevada mountain range and the California montane chaparral and woodlands, and to the south and east by the Sonoran Desert. The boundaries to the east of the Mojave Desert are less distinctive than the other boundaries because there is no presence of an indicator species, such as the Joshua tree (Yucca brevifolia),<ref name=":3">Template:Cite book</ref> which is endemic to the Mojave Desert. The Mojave Desert is distinguished from the Sonoran Desert and other deserts adjacent to it by its warm temperate climate, as well as flora and fauna such as ironwood (Olneya tesota), blue Palo Verde (Parkinsonia florida), chuparosa (Justicia californica), spiny menodora (Menodora spinescens), desert senna (Cassia armata), California dalea (Psorothamnus arborescens), California fan palm (Washingtonia filifera) and goldenhead (Acamptopappus shockleyi). Along with these other factors, these plants differentiate the Mojave from the nearby Sonoran Desert.<ref name=":0" />

The Mojave Desert is bordered by the San Andreas Fault to the southwest and the Garlock fault to the north. The mountains elevated along the length of the San Andreas fault provide a clear border between the Mojave Desert and the coastal regions to the west.<ref name=Dibblee /> The Garlock Fault separates the Mojave Desert from the Sierra Nevada and Tehachapi mountains, which provide a natural border to the Mojave Desert. There are also abundant alluvial fans, called bajadas, that form around the mountains within the Mojave Desert and extend down toward the low-altitude basins.<ref name=":3" /> These basins contain dried lake beds called playas, where water generally collects and evaporates, leaving large volumes of salt. These playas include Rogers Dry Lake and China Lake. Dry lakes are a noted feature of the Mojave landscape.<ref name=":0" /> The Mojave Desert is also home to the Devils Playground, about Template:Convert of dunes and salt flats going in a northwest-southeasterly direction. The Devil's Playground is a part of the Mojave National Preserve and is between the town of Baker, California and the Providence Mountains. The Cronese Mountains are within the Devil's Playground.

There are very few surface rivers in the Mojave Desert, but two major rivers generally flow underground. One is the intermittent Mojave River, which begins in the San Bernardino mountains and disappears underground in the Mojave Desert.<ref>Template:Cite web</ref> The other is the Amargosa River, which flows partly underground through the Mojave Desert along a southward path.<ref>Template:Cite magazine</ref> The Manix, Mojave, and the Little Mojave lakes are large but shallow.<ref name=":3"/>Template:Rp Soda Lake is the principal saline basin of the Mojave Desert. Natural springs are typically rare throughout the Mojave Desert,<ref name=":3"/>Template:Rp but there are two notable springs, Ash Meadows and Oasis Valley. Ash Meadows is formed from several other springs, which draw from deep underground. Oasis Valley draws from the nearby Amargosa River.

Climate

Extremes in temperatures throughout the seasons characterize the climate of the Mojave Desert. Freezing temperatures and strong winds are not uncommon in the winter, as well as precipitation such as rain and snow in the mountains. In contrast, temperatures above Template:Convert are not uncommon during the summer months.<ref>Template:Cite web</ref> It receives annual average precipitation of Template:Convert, although regions at high altitudes such as the portion of the Mojave Desert in the San Gabriel mountains may receive more rain.<ref name=Dibblee /><ref name=":1" /> Most precipitation in the Mojave comes from Pacific cyclonic storms as they migrate eastwards from November to April.<ref name=Dibblee/> Such storms generally bring rain and snow only in the mountainous regions, increasing aridity on the leeward slopes.<ref name=Dibblee />

During the late summer months, there is also the possibility of strong thunderstorms, which bring heavy showers or cloudbursts. These storms can result in flash flooding.<ref>Template:Cite web</ref>

A powerful High Desert summer storm sweeps rapidly across the Mojave Desert.

The Mojave Desert has not historically supported a fire regime because of low fuel loads and connectivity. However, in the last few decades, invasive annual plants such as some within the genera Bromus, Schismus and Brassica have facilitated fires by serving as a fuel bed. This has significantly altered many areas of the desert. At higher elevations, fire regimes are regular but infrequent.<ref>Template:Cite journal</ref>

Cities and regions

Las Vegas is in the Mojave Desert.

While the Mojave Desert is generally sparsely populated, it has increasingly become urbanized in recent years.<ref name=":1" /><ref name=":0" /> The metropolitan areas include Las Vegas, the largest urban area in the Mojave and the largest urban area in Nevada with a population of about 2.3 million.<ref>Template:Cite web</ref> St. George, Utah, is the northeasternmost metropolitan area in the Mojave, with a population of around 180,000 in 2020, and is located at the convergence of the Mojave, Great Basin, and Colorado Plateau. The Los Angeles exurban area of Lancaster-Palmdale has more than 400,000 residents, and the Victorville area to its east (also known as Victor Valley) has around 550,000 residents.<ref name=":1" /> Smaller cities or micropolitan areas in the Mojave Desert include Helendale, Lake Havasu City, Kingman, Laughlin, Bullhead City, Pahrump, and Twentynine Palms. All have experienced rapid population growth since 1990. The California portion of the desert also contains Edwards Air Force Base and Naval Air Weapons Station China Lake, noted for experimental aviation and weapons projects.<ref name="AFSCHIST">Template:Cite web</ref><ref name="China Lake">Template:Cite web</ref>

The Mojave Desert has several ghost towns. The most significant are the silver and copper-mining town of Calico, California, and the old railroad depot of Kelso, California. Some of the other ghost towns are more modern, created when U.S. Route 66 (and the lesser-known U.S. Route 91) was abandoned in favor of the construction of Interstates. CA SR 14, Interstate 15, Interstate 40, CA SR 58, CA SR 138, US Route 95, and US Route 395 are the main highways that traverse the Mojave Desert.<ref>Template:Cite web</ref>

Geology

Rock formations in Joshua Tree National Park

The exposed geology of the Death Valley presents a diverse and complex set of at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related formations geologists call a group. The oldest rocks in the area that now includes Death Valley National Park are extensively metamorphosed by intense heat and pressure and are at least 1700 million years old. These rocks were intruded by a mass of granite 1400 Ma (million years ago) and later uplifted and exposed to nearly 500 million years of erosion.<ref name=Harris>Template:Cite book</ref>Template:Rp

The rock that forms the Mojave Desert was created under shallow water in the Precambrian,<ref name=":3"/>Template:Rp<ref name=Dibblee/>Template:Rp forming thick sequences of conglomerate, mudstone, and carbonate rock topped by stromatolites, and possibly glacial deposits from the hypothesized Snowball Earth event.<ref name=Collier>Template:Cite book</ref>Template:Rp Rifting thinned huge roughly linear parts of the supercontinent Rodinia enough to allow sea water to invade and divide its landmass into component continents separated by narrow straits.<ref name=Harris/>Template:Rp A passive margin developed on the edges of these new seas in the Death Valley region.<ref name=Harris/>Template:Rp Carbonate banks formed on this part of the two margins only to be subsided as the continental crust thinned until it broke, giving birth to a new ocean basin. An accretion wedge of clastic sediment then started to accumulate at the base of the submerged precipice, entombing the region's first known fossils of complex life.

During the Paleozoic era, the area that is now the Mojave was again likely submerged under a greater sea.<ref name=Dibblee>Template:Cite book</ref>Template:Rp The passive margin switched to active margin in the early-to-mid Mesozoic when the Farallon Plate under the Pacific Ocean started to dive below the North American Plate, initiating a subduction zone; volcanoes and uplifting mountains were produced as a result.<ref name=Harris/>Template:Rp Erosion over many millions of years formed a relatively featureless plain.

Stretching of the crust under western North America started around 16 Ma and is thought to be caused by upwelling from the subducted spreading-zone of the Farallon Plate. This process continues into the present and is thought to be responsible for producing the Basin and Range province. By 2 to 3 million years ago this province had spread to the Death Valley area, ripping it apart and giving birth to Death Valley, Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the current ice age, with lakes. Lake Manly was the largest of these lakes; it filled Death Valley during each glacial period from 240,000 years ago to 10,000 years ago. By 10,500 years ago these lakes were increasingly cut off from glacial melt from the Sierra Nevada, starving them of water and concentrating salts and minerals. The desert environment seen today developed after these lakes dried up.

The Mojave Desert is a source of various minerals and metallic materials. Due to the climate, there is an accumulation of weathered bedrock and fine sand and silt, forming colluvium.<ref>Template:Cite journal</ref> Deposits of gold, tungsten, and silver were heavily exploited prior to the Second World War.<ref name=Dibblee/>Template:Rp Deposits of copper, tin, lead-zinc, manganese, iron, and various radioactive substances are known to exist but have not been commercially mined.<ref name=Dibblee />Template:Rp

Ecology

Flora

Flora of the Mojave Desert consists of various endemic plant species, notably the Joshua Tree, a notable indicator species. There is more endemic flora in the Mojave Desert than almost anywhere in the world.<ref name=":0" /> Mojave Desert flora is not a vegetation type, although the plants in the area have evolved in isolation because of the physical barriers of the Sierra Nevada and the Colorado Plateau. Predominant plants of the Mojave Desert include all-scale (Atriplex polycarpa), creosote bush (Larrea tridentata), brittlebush (Encelia farinosa), desert holly (Atriplex hymenelytra), white burrobush (Hymenoclea salsola), and famously, the Joshua tree (Yucca brevifolia). Additionally, the Mojave Desert is also home to various species of cacti, such as silver cholla (Cylindropuntia echinocarpa), Mojave prickly pear (O. erinacea), beavertail cactus (O. basilaris), and many-headed barrel cactus (Homalocephala polycephala, syn. Echinocactus polycephalus). Less common but distinctive plants of the Mojave Desert include ironwood (Olneya tesota), blue Palo Verde (Parkinsonia florida), chuparosa (Justicia californica), spiny menodora (Menodora spinescens), desert senna (Cassia armata), California dalea (Psorothamnus arborescens), and goldenhead (Acamptopappus shockleyi). The Mojave Desert is generally abundant in winter annuals.<ref name=":3"/>Template:Rp The plants of the Mojave Desert generally correspond to individual geographic features, resulting in the formation of distinctive flora communities.<ref>Template:Cite web</ref>

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  A depiction of cassia armata, which is particularly characteristic of the Mojave
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  California Dalea, an indicator species of the Mojave Desert
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  Goldenhead (Acamptopappus shockleyi) an indicator species of the Mojave
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  Silver cholla (Opuntia echinocarpa), a common species of cacti in the Mojave
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  A creosote bush, which is common in the Mojave

Fauna

A desert tortoise

Notable species of the Mojave Desert include bighorn sheep (Ovis canadensis), mountain lions (Puma concolor), black-tailed jackrabbits (Lepus californicus), and desert tortoises (Gopherus agassizii).<ref name=":0"/> Various other species are particularly common in the Mojave Desert, such as the LeConte's thrasher (Toxostoma lecontei), banded gecko (Coleonyx variegatus), desert iguana (Dipsosaurus dorsalis), chuckwalla (Sauromalus obesus), and regal horned lizard (Phrynosoma solare).<ref name=":0"/> Species of snake include the rosy boa (Lichanura trivirgata), Western patch-nosed snake (Salvadora hexalepis), and Mojave rattlesnake (Crotalus scutulatus).<ref name=":0"/> These species can also occur in the neighboring Sonoran and Great Basin deserts.

The animal species of the Mojave Desert have generally fewer endemics than its flora. However, endemic fauna of the Mojave Desert include Kelso Dunes Jerusalem cricket (Ammopelmatus kelsoensis), the Kelso Dunes shieldback katydid (Eremopedes kelsoensis), the Mohave ground squirrel (Spermophilus mohavensis) and Amargosa vole (Microtus californicus scirpensis).<ref>Template:Cite journal</ref> The Mojave fringe-toed lizard (Uma scoparia) is not endemic, but almost completely limited to the Mojave Desert. There are also aquatic species that are found nowhere else,<ref name=":4"/> such as the Devils Hole pupfish, limited to one hot spring near Death Valley.<ref>Template:Cite web</ref>

In society

History

Before the European colonization of North America, tribes of Native Americans, such as the Mohave, were hunter-gatherers living in the Mojave Desert.<ref name=MojaveNPS>Template:Cite web</ref>

European explorers started exploring the deserts beginning in the 18th century. Francisco Garcés, a Franciscan friar, was the first explorer of the Mojave Desert in 1776.<ref name=MojaveNet>Template:Cite web</ref> Garcés recorded information about the original inhabitants of the deserts.

Later, as American interests expanded into California, American explorers started probing the California deserts. Jedediah Smith traveled through the Mojave Desert in 1826, finally reaching the San Gabriel Mission.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>

Human development

STS-126 The Space Shuttle Endeavour mounted atop its modified Boeing 747 carrier aircraft flies over California's Mojave Desert on its way back to the Kennedy Space Center in Florida on December 10, 2008.

In recent years, human development in the Mojave Desert has increased. Major urban and suburban centers including Las Vegas and Los Angeles increasingly damaged the wildlife.<ref name=":0" /> An added demand for landfill space as a result of the large metropolitan centers of Las Vegas and Los Angeles may drastically affect flora and fauna. Agricultural development along the Colorado River, close to the eastern boundary of the Mojave Desert, causes habitat loss and degradation.<ref name=":1" /><ref name=":0" /> Areas particularly affected by human development include Ward Valley and Riverside County. The United States military maintains installations in the Mojave Desert, making it a critical training location for the United States Department of Defense.<ref name=":2">Template:Cite web</ref> Miners, ranchers, and farmers rely on the desert for a living.<ref name=":4">Template:Cite web</ref> The Mojave is used by the state of California to meet renewable energy objectives. Large tracts of the desert are owned by federal agencies and are leased at low cost by wind and solar energy companies, although these renewable developments can cause their own environmental impact and disturb cultural landscapes and visual resources.<ref>Template:Cite news</ref> Desert Sunlight Solar Farm, one of the largest solar farms in the world, was built approximately five miles from Joshua Tree National Park. An endangered Yuma clapper rail was found dead at the site in 2014, spurring efforts from conservation groups to protect birds from the so-called lake effect, a phenomenon in which birds can mistake the reflective glare of solar panels for a body of water.<ref>Template:Cite web</ref>

Tourism

Template:Wide image The Mojave Desert is one of the most popular spots for tourism in North America, primarily because of the international destination of Las Vegas. The Mojave is also known for its scenery, playing host to Death Valley National Park, Joshua Tree National Park, and the Mojave National Preserve. Lakes Mead, Mohave, and Havasu provide water sports recreation, and vast off-road areas entice off-road enthusiasts. The Mojave Desert also includes three California State Parks, the Antelope Valley California Poppy Reserve, in Lancaster, Saddleback Butte State Park, in Hi Vista and Red Rock Canyon State Park. Mojave Narrows Park, operated by San Bernardino County, is a former ranch along the Mojave River.<ref>Template:Cite news</ref>

Several attractions and natural features are in the Calico Mountains. Calico Ghost Town, in Yermo, is administered by San Bernardino County. The ghost town has several shops and attractions and inspired Walter Knott to build Knott's Berry Farm. The Bureau of Land Management also administers Rainbow Basin and Owl Canyon.

Conservation status

A field of California poppies in the California Poppy Reserve in Antelope Valley

The Mojave Desert is one of the best protected distinct ecoregions in the United States<ref name=":0" /> as a result of the California Desert Protection Act, which designated 69 wilderness areas and established Death Valley National Park, Joshua Tree National Park, and the Mojave National Preserve.<ref>Template:Cite book</ref> However, the southwest and central east portions of the Mojave Desert are particularly threatened as a result of off-road vehicles, increasing recreational use, human development, and agricultural grazing.<ref name=":0" /> The World Wildlife Fund lists the Mojave Desert as relatively "stable/intact".<ref name=":0" />

Various habitats and regions of have been protected by statute. Notably, Joshua Tree National Park, Death Valley National Park, and the Mojave National Preserve by the California Desert Protection Act of 1994 (Pub.L. 103–433). Various federal and state land agencies have protected regions within the Mojave Desert. These include Antelope Valley California Poppy Reserve, which protects the fields of California poppies, Mojave Trails National Monument, Desert Tortoise Natural Area, Arthur B. Ripley Desert Woodland State Park, Desert National Wildlife Refuge, Lake Mead National Recreation Area, Providence Mountains State Recreation Area, Red Cliffs National Conservation Area, Red Rock Canyon State Park, Saddleback Butte State Park, Snow Canyon State Park and Valley of Fire State Park. In 2013, the Mojave Desert was further protected from development by the Desert Renewable Energy Conservation Plan (DRECP), in which the Bureau of Land Management designated 4.2 million acres of public land as protected wilderness as part of the National Conservation Lands of the California Desert.<ref>Template:Cite web</ref>

Cultural significance

The Mojave Desert has served as a backdrop for a number of films. At least eleven music videos were recorded in the Mojave Desert:

• "Make It Wit Chu" by Queens of the Stone Age
• "Say You'll Be There" by the Spice Girls<ref>Template:Cite web</ref>
• "Goodbye" by Mimi Webb<ref>Template:Cite tweet</ref><ref>Template:Cite web</ref>
• "Bodies" by Robbie Williams
• "Burden in My Hand" by Soundgarden
• "Breathless" by The Corrs
• "What Took You So Long?" by Emma Bunton
• "Desert Rose" by Sting
• "That Don't Impress Me Much" by Shania Twain
• "Frozen" by Madonna
• "Run the World (Girls)" by Beyoncé

Photographs related to U2's 1987 album The Joshua Tree were taken in the Mojave Desert.<ref>Template:Cite web</ref>

External links

• The Nature Explorers Mojave Desert Expedition – 1 hour 27 minute ecosystem video in July
• Mojave Desert images at bioimages.vanderbilt.edu
• Mojave Desert Catalog Project