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Amboy Crater
Amboy Crater is a dormant cinder cone volcano that rises above a lava field in the eastern Mojave Desert of southern California, within Mojave Trails National Monument. It is about equidistant from Barstow to the west and Needles to the east, and south of historic U.S. Route 66, near the town of Amboy in San Bernardino County. In 1973, Amboy Crater was designated the Amboy Crater National Natural Landmark. Location The crater's location is southwest of the town of Amboy and the Route 66- National Trails Highway. The Bullion Mountains are to the west, and the Bristol Mountains to the northeast. Description This cinder cone is estimated to be 79,000 years old (+/- 5,000 years)http://alliance.la.asu.edu/rockart/vmltest/PhillipsMojaveTest.pdf . accessed 3/25/2013 and was formed in layers of mostly vesicular pahoehoe during the Pleistocene geological period. The interior has a solidified lava lake. Lava flows as old as Amboy Crater itself blanket the surrounding area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bureau Of Land Management
The Bureau of Land Management (BLM) is an agency within the United States Department of the Interior responsible for administering federal lands, U.S. federal lands. Headquartered in Washington, D.C., the BLM oversees more than of land, or one-eighth of the United States's total landmass. The Bureau was created by United States Congress, Congress during the presidency of Harry S. Truman in 1946 by combining two existing agencies: the United States General Land Office and the United States Grazing Service, Grazing Service. The agency manages the federal government's nearly of subsurface Mineral rights, mineral estate located beneath federal, state and private lands severed from their surface rights by the Homestead Act of 1862. Most BLM public lands are located in these 12 Western United States, western states: Alaska, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington (state), Washington and Wyoming. The mission of the BLM is "to susta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amboy Crater At Dusk
Amboy may refer to: Places Argentina * Amboy, Córdoba, commune in Calamuchita Department, Córdoba Province United States * Amboy Crater, feature in Mojave National Preserve, California Settled U.S. places * Amboy, California * Amboy, Georgia * Amboy, Illinois * Amboy, Indiana * Amboy, Kansas * Amboy, Minnesota * Amboy, Nebraska * New Jersey: ** Perth Amboy, New Jersey ** South Amboy, New Jersey ** The Amboys, area of New Jersey that includes both Perth Amboy and South Amboy * Amboy, New York * Amboy, Washington Other uses * ''Amboy'' (ship) * Camden and Amboy Railroad and Transportation Company The Camden and Amboy Railroad and Transportation Company, usually shortened to the Camden and Amboy Railroad (C&A), was a railway company in New Jersey. It was incorporated in 1830 and opened its first line in 1832, making it one of the oldest ra ... See also * Amboy Township (other) * The Amboy Dukes (other) {{dab, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unexploded Ordnance
Unexploded ordnance (UXO, sometimes abbreviated as UO) and unexploded bombs (UXBs) are explosive weapons (bombs, shell (projectile), shells, grenades, land mines, naval mines, cluster munition, and other Ammunition, munitions) that did not explosion, explode when they were deployed and remain at risk for Detonation#Applications, detonation, sometimes many decades after they were used or discarded. When unwanted munitions are found, they are sometimes destroyed in Controlled explosion, controlled explosions, but accidental detonation of even very old explosives might also occur, sometimes with fatal consequences. For example, UXO from World War I continues to be a hazard, with poisonous gas filled munitions still a problem. UXO does not always originate from conflict; areas such as military training bases can also hold significant numbers, even after the area has been abandoned. Seventy-eight countries are contaminated by land mines, which kill or maim 15,000–20,000 people ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rattlesnake
Rattlesnakes are venomous snakes that form the genus, genera ''Crotalus'' and ''Sistrurus'' of the subfamily Crotalinae (the pit vipers). All rattlesnakes are vipers. Rattlesnakes are predators that live in a wide array of habitats, hunting small animals such as birds and rodents. Rattlesnakes receive their name from the #Rattle, rattle located at the end of their tails, which makes a loud rattling noise when tail vibration, vibrated that deters predators. Rattlesnakes are the leading contributor to snakebite injuries in North America, but rarely bite unless provoked or threatened; if treated promptly, the bites are seldom fatal. The 36 known List of rattlesnake species and subspecies, species of rattlesnakes have between 65 and 70 subspecies, all native to the Americas, ranging from central Argentina to southern Canada. The largest rattlesnake, the Eastern diamondback rattlesnake, eastern diamondback, can measure up to in length. Rattlesnakes are preyed upon by hawks, wease ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trailhead
A trailhead is the point where a trail begins or is accessed, where the trail is often intended for hiking, biking, horseback riding, or off-road vehicles. Modern trailheads often contain restrooms, maps, signposts, and distribution centers for informational brochures about the trail and its features and parking areas for vehicles and trailers. The United States Access Board defines a trailhead "as an outdoor space that is designated by an entity responsible for administering or maintaining a trail to serve as an access point to the trail." The intersection of two trails is a trail junction and does not constitute a trailhead. Historically, the cities located at the terminus of major pathways for foot traffic, such as the Natchez Trace and the Chisholm Trail, were also known as trailheads. For mountain climbing and hiking, the elevation of the trailhead above sea level Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mojave National Preserve
Mojave National Preserve is a United States National Preserve located in the Mojave Desert of San Bernardino County, California, US, between Interstate 15 in California, Interstate 15 and Interstate 40. The preserve was established October 31, 1994, with the enactment of the California Desert Protection Act by the United States Congress, which also established Joshua Tree National Park and Death Valley National Park as National park, National Parks. Previously, some lands contained within the Preserve were the East Mojave National Scenic Area, under the jurisdiction of the Bureau of Land Management. At , within the contiguous United States it is the third largest unit of the National Park System and the first largest National preserve, National Preserve. The preserve was created within the Pacific West Region of the National Park Service and remains within that jurisdiction today. Natural features include the Kelso Dunes, the Marl Mountains and the Cima Dome & Volcanic Field Nat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitchell Caverns
The Mitchell Caverns, within the Mitchell Caverns Natural Preserve, are three solution limestone caves, only two of which are open to the public, located on the east side of the Providence Mountains at an elevation of , within the Providence Mountains State Recreation Area. The caverns are located in the Mojave Desert, in San Bernardino County, California. Geology The caves lie within a thick sequence of marine Permian limestone. They were formed before the Pleistocene epoch, when ground water with a high carbonic acid content ate into the surrounding sedimentary limestone. Stalactites, stalagmites, and other cave formations were formed from calcium carbonate left by dripping mineral water. History Numerous paleontological and archaeological finds have been made in and around the caverns. Scientists have found the remains of several prehistoric animals, including a Shasta ground sloth. The caverns were a special place for the Chemehuevi Indians, and a number of tools and mater ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interstate 40
Interstate 40 (I-40) is a major east–west transcontinental Interstate Highway System, Interstate Highway in the Southeastern United States, southeastern and Southwestern United States, southwestern portions of the United States. At a length of , it is the third-longest Interstate Highway in the country, after Interstate 90, I-90 and Interstate 80, I-80. From west to east, it passes through California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, and North Carolina. Its western terminus is at Interstate 15 in California, I-15 in Barstow, California, while its eastern terminus is at a concurrency (road), concurrency with U.S. Route 117 in North Carolina, U.S. Route 117 (US 117) and North Carolina Highway 132 (NC 132) in Wilmington, North Carolina. Major cities served by the Interstate include Flagstaff, Arizona; Albuquerque, New Mexico; Amarillo, Texas; Oklahoma City, Oklahoma; Fort Smith, Arkansas, Fort Smith and Little Rock in Arkansas; Memphis, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial planet, rocky planet or natural satellite, moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of volcanism on Venus, Venus, which cover ~80% of the surface, are basaltic; the lunar mare, lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava Lake
Lava lakes are large volumes of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. The term is used to describe both lava lakes that are wholly or partly molten and those that are solidified (sometimes referred to as ''frozen lava lakes''). Formation Lava lakes can form in three ways: *from one or more vents in a crater that erupts enough lava to partially fill the crater; or *when lava pours into a crater or broad depression and partially fills the crater; or *atop a new vent that erupts lava continuously for a period of several weeks or more and slowly builds a crater progressively higher than the surrounding ground. Behaviors Lava lakes occur in a variety of volcanic systems, ranging from the basaltic Erta Ale lake in Ethiopia and the basaltic andesite volcano of Villarrica, Chile, to the unique phonolitic lava lake at Mt. Erebus, Antarctica. Lava lakes have been observed to exhibit a range of behaviours. A "constantly circu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( ; referred to colloquially as the ''ice age, Ice Age'') is the geological epoch (geology), epoch that lasted from to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek () 'most' and (; Latinized as ) 'new'. The aridification and cooling trends of the preceding Neogene were continued in the Pleistocene. The climate was strongly variable depending on the glacial cycle, oscillating between cold Glacial period, glacial periods and warmer Interglacial, int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pahoehoe
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is often also called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. Etymology The word ''lava'' comes from Italian and is probably derived from the Latin word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
