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Big Bend National Park
Big Bend National Park is an American national park located in West Texas, bordering Mexico. The park has national significance as the largest protected area of Chihuahuan Desert topography and ecology in the United States, and was named after a large bend in the Rio Grande/Río Bravo. The park protects more than 1,200 species of plants, more than 450 species of birds, 56 species of reptiles, and 75 species of mammals. Additional park activities include scenic drives, programs led by Big Bend park rangers, and stargazing. The area has a rich cultural history, from archeological sites dating back nearly 10,000 years to more recent pioneers, ranchers, and miners. The Chisos Mountains are located in the park, and are the only mountain range in the United States to be fully contained within the boundary of a national park. Geological features in the park include sea fossils and dinosaur bones, as well as volcanic dikes. The park encompasses an area of , entirely within Brewst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rio Grande
The Rio Grande ( and ), known in Mexico as the Río Bravo del Norte or simply the Río Bravo, is one of the principal rivers (along with the Colorado River) in the southwestern United States and in northern Mexico. The length of the Rio Grande is . It originates in south-central Colorado, in the United States, and flows to the Gulf of Mexico. The Rio Grande drainage basin (watershed) has an area of ; however, the endorheic basins that are adjacent to and within the greater drainage basin of the Rio Grande increase the total drainage-basin area to . The Rio Grande with Rio Grande Valley (landform), its fertile valley, along with its tributaries, is a vital watersource for seven US and Mexican states, and flows primarily through arid and semi-arid lands. After traversing the length of New Mexico, the Rio Grande becomes the Mexico–United States border, between the U.S. state of Texas and the northern Mexican states of Chihuahua (state), Chihuahua and Coahuila, Nuevo León a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dike (geology)
A dike or dyke, in Geology, geological usage, is a sheet of rock that is formed in a Fracture (geology), fracture of a pre-existing rock body. Dikes can be either Intrusive rock, magmatic or Sedimentary rock, sedimentary in origin. Magmatic dikes form when magma flows into a crack then solidifies as a sheet intrusion, either cutting across layers of rock or through a contiguous mass of rock. Clastic dikes are formed when sediment fills a pre-existing crack.Essentials of Geology, 3rd Ed, Stephen Marshak Magmatic dikes A magmatic dike is a sheet of igneous rock that cuts across older rock beds. It is formed when magma fills a fracture in the older beds and then cools and solidifies. The dike rock is usually more resistant to weathering than the surrounding rock, so that erosion exposes the dike as a natural wall or ridge. It is from these natural walls that dikes get their name. Dikes preserve a record of the fissures through which most mafic magma (fluid magma low in silica) reac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one-third of the land surface of the Earth is arid or semi-arid. This includes much of the polar regions, where little precipitation occurs, and which are sometimes called polar deserts or "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location. Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks, which consequently break in pieces. Although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods. Rain falling on hot rocks can cause them to shatter, and the resulting fragments and rubble strewn over the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quercus Graciliformis
''Quercus graciliformis'' (also known as the Chisos oak or slender oak) is a rare North American species of oak tree. Description ''Quercus graciliformis'' is a deciduous tree up to tall. The leaves are elliptical or lance-shaped with 8–10 shallow lobes. The acorns are produced biennially. Distribution The species has been found only in the Chisos Mountains, within Big Bend National Park of West Texas, and a few miles southeast into the state of Coahuila in northeast Mexico. It is threatened by habitat loss Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby .... It grows on dry, rocky canyon floors at elevations above . References graciliformis Endemic flora of Texas Flora of Coahuila Flora of the Rio Grande valleys Big Bend National Park Plants described in 1934 Cri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emory Peak
Emory Peak, located in Big Bend National Park, is the highest peak in the Chisos Mountains and the highest in Brewster County. The peak is named for William H. Emory, the chief surveyor of the U.S. Boundary Survey team of 1852. From the Chisos Basin the peak appears to be a minor ridge, while the summit of Casa Grande, one mile closer, seems to be much taller. From the west, Emory Peak is clearly visible as a point slightly higher than most of the mountain range. The peak can be reached by a moderate hike on a well-marked path across steep rocky terrain with an elevation gain of approximately . The Emory Peak Trail is about long. The trail is reached by climbing the Pinnacles Trail from the Chisos Basin trailhead. Once at the base there is a semi-technical rock scramble to navigate before reaching the summit. No gear is needed for this climb although hikers should take great care. High-desert flora and fauna including alligator juniper (''Juniperus deppeana''), pinyon pine ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hot Semi-arid Climate
A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-arid climates, depending on variables such as temperature, and they give rise to different biomes. Defining attributes of semi-arid climates A more precise definition is given by the Köppen climate classification, which treats steppe climates (''BSk'' and ''BSh'') as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential. Semi-arid climates tend to support short, thorny or scrubby vegetation and are usually dominated by either grasses or shrubs as it usually can't support forests. To determine if a location has a semi-arid climate, the precipitation threshold must first be determined. The method used to find the precipitation threshold (in millimeters): *multiply by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Köppen Climate Classification
The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notably in 1918 and 1936. Later, the climatologist Rudolf Geiger (1894–1981) introduced some changes to the classification system, which is thus sometimes called the Köppen–Geiger climate classification system. The Köppen climate classification divides climates into five main climate groups, with each group being divided based on seasonal precipitation and temperature patterns. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (temperate), ''D'' (continental), and ''E'' (polar). Each group and subgroup is represented by a letter. All climates are assigned a main group (the first letter). All climates except for those in the ''E'' group are assigned a seasonal precipitation subgroup (the second letter). For example, ''Af'' indi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NPS Big-bend-national-park-map
NPS may refer to: Organizations * National Park Service, U.S. * National Pension System, India * National Pension Service, Korea * National Phobics Society, UK charity * National Piers Society, UK charity * National Poetry Slam, competition * National Probation Service, a statutory criminal justice service for England and Wales * Nederlandse Programma Stichting, a Dutch broadcasting foundation now part of ''Omroep NTR'' * Nigerian Prisons Services * NPS MedicineWise, known prior to 2009 as the National Prescribing Service, a medical information provider in Australia * Nunavik Police Service in Quebec, Canada Science, medicine and pharmaceutics * Nail–patella syndrome, an autosomal dominant genetic disorder * Neuropeptide S, a neuropeptide found in human and mammalian brain * New psychoactive substance * Nonpoint source pollution * NPS Pharmaceuticals, acquired by Shire in 2015 Technology * Network Policy Server, component of Microsoft Server 2008 Pipes and pipe threads ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maderas Del Carmen
Maderas del Carmen is a biosphere reserve in the northern Mexican state of Coahuila. Maderas del Carmen encompasses part of the Sierra del Carmen, a northern finger of the Sierra Madre Oriental range. The reserve includes both dry Chihuahuan Desert shrublands and forested sky island, high-elevation enclaves of Sierra Madre Oriental pine-oak forest. The reserve is home to 400 bird species and 70 mammal species, including the American black bear (''Ursus americanus''), collared peccary (''Pecari tajacu''), and cougar (''Puma concolor''). The region was designated a biosphere reserve in 2006. It is located in the municipalities of Ocampo, Ciudad Acuña, and Múzquiz. Conservation efforts The isolation of the Sierra del Carmen and its relatively undisturbed environment has led to conservation efforts in Mexico and jointly with the United States. Much of the Sierra del Carmen has been declared by the government of Mexico the Maderas del Carmen Flora and Fauna Protected Area, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cañón De Santa Elena Flora And Fauna Protection Area
The Cañón de Santa Elena Flora and Fauna Protection Area (Spanish: ''Área de Protección de Flora y Fauna Cañón de Santa Elena'') is a protected area for plants and wildlife in the Mexican municipalities of Manuel Benavides and Ojinaga, in the state of Chihuahua. It was founded on November 7, 1994 and has an area of 277,209 hectares. The purpose of the reserve is to protect the Chihuahuan Desert, home to many species of plants and wildlife. Among the first scrub stands microphyll desert, the desert scrub rosetophilous, the pasture, the oak forest and riparian vegetation, including various species abound. In the second highlights the birds and mammals that have adapted to aridity, such as wildcat and some deer, as well as birds of prey. History The arrowheads, mortars and paintings found at the site indicate the following human occupation periods: Paleo-Indian (15,000–6,500 BC), Archaic (6500 BC – 900 AD), early Postclassic (900–1500 AD), and late Postclassic (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treaty Of Guadalupe Hidalgo
The Treaty of Guadalupe Hidalgo ( es, Tratado de Guadalupe Hidalgo), officially the Treaty of Peace, Friendship, Limits, and Settlement between the United States of America and the United Mexican States, is the peace treaty that was signed on 2 February 1848, in the Villa de Guadalupe Hidalgo (now a neighborhood of Mexico City) between the United States and Mexico that ended the Mexican–American War (1846–1848). The treaty was ratified by the United States on 10 March and by Mexico on 19 May. The ratifications were exchanged on 30 May, and the treaty was proclaimed on 4 July 1848. With the defeat of its army and the fall of its capital in September 1847, Mexico entered into negotiations with the U.S. peace envoy, Nicholas Trist, to end the war. On the Mexican side, there were factions that did not concede defeat or seek to engage in negotiations. The treaty called for the United States to pay US$15 million to Mexico and to pay off the claims of American citizens against Mex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
