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Chaos Crags
Chaos Crags is the youngest group of lava domes in Lassen Volcanic National Park, California. They formed as six dacite domes 1,100-1,000 years ago, one dome collapsing during an explosive eruption about 70 years later. The eruptions at the Chaos Crags mark one of just three instances of Holocene activity within the Lassen volcanic center. The cluster of domes is located north of Lassen Peak and form part of the southernmost segment of the Cascade Range in Northern California. Each year, a lake forms at the base of the Crags, and typically dries by the end of the summer season. From the base of the crags and extending toward the northwest corner of the park is Chaos Jumbles, a rock avalanche that undermined Chaos Crags' northwest slope 300 years ago. Riding on a cushion of compressed air (see sturzstrom), the rock debris traveled at about , flattened the forest before it, and dammed Manzanita Creek, forming Manzanita Lake. In addition to the possibility of forming additio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lassen Peak
Lassen Peak ( ), commonly referred to as Mount Lassen, is a lava dome volcano and the southernmost active volcano in the Cascade Range of the Western United States. Located in the Shasta Cascade region of Northern California, it is part of the Cascade Volcanic Arc, which stretches from southwestern British Columbia to northern California. Lassen Peak reaches an elevation of , standing above the northern Sacramento Valley. It supports many flora and fauna among its diverse habitats, which are subject to frequent snowfall and reach high elevations. Lassen Peak has a volume of , making it one of the largest lava domes on Earth. The volcano arose from the former northern flank of now-eroded Mount Tehama about 27,000 years ago, from a series of eruptions over the course of a few years. The mountain has been significantly eroded by glaciers over the last 25,000 years, and is now covered in talus deposits. On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated near ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lassen Volcanic National Park
Lassen Volcanic National Park is an American national park in northeastern California. The dominant feature of the park is Lassen Peak, the largest lava dome, plug dome volcano in the world and the southernmost volcano in the Cascade Range. Lassen Volcanic National Park is one of the few areas in the world where all four types of volcano can be found—plug dome, shield volcano, shield, volcanic cone#Cinder cone, cinder cone, and stratovolcano. The source of heat for the volcanism in the Lassen area is subduction of the Gorda Plate diving below the North American Plate off the Northern California coast. The area surrounding Lassen Peak is still active with boiling mud pots, fumaroles, and hot springs. Lassen Volcanic National Park started as two separate U.S. National Monument, national monuments designated by President Theodore Roosevelt in 1907: Cinder Cone National Monument and Lassen Peak National Monument. Starting in May 1914 and lasting until 1917, a series of minor to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manzanita Lake
Manzanita Lake is a lake located in Lassen Volcanic National Park. The name means "little apple" in Spanish. Manzanita Lake was formed when Manzanita Creek was dammed 300 years ago by a rock avalanche from the northwest slope of the Chaos Crags, which also resulted in the debris formation known as Chaos Jumbles. The area around the lake features the Loomis Museum, a campground, and the Manzanita Lake Naturalist's Services Historic District. Located near the park entrance, the lake is open for fishing and has rainbow, brown and brook trout. Climate Manzanita Lake has a warm-summer humid continental climate (Dsb) using the 0 °C isotherm or a warm-summer mediterranean climate ( Csb) using the -3 °C isotherm with short, warm summers and cool winters, with most precipitation falling in the winter months. Gallery Chaos Crags and Lassen Peak at Manzanita Lake.jpg, View of Chaos Crags and Lassen Peak from the lakeshore. Fishing on Manzanita Lake.jpg, Fishing on Manz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mafic
A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. Mafic materials can also be described as ferromagnesian. History The term ''mafic'' is a portmanteau of "magnesium" and "ferric" and was coined by Charles Whitman Cross, Joseph P. Iddings, Louis Valentine Pirsson, and Henry Stephens Washington in 1912. Cross' group had previously divided the major rock-forming minerals found in igneous rocks into ''salic'' minerals, such as quartz, feldspars, or feldspathoids, and ''femic'' minerals, such as olivine and pyroxene. However, micas and aluminium-rich amphiboles were excluded, while some calcium minerals containing little iron or magnesium, such as wollastonite or apatite, were included ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Volcano Observatory
The California Volcano Observatory (CalVO) is the volcano observatory that monitors the volcanic and geologic activity of California and Nevada. It is a part of the Volcano Hazards Program of the United States Geological Survey, a scientific agency of the United States government. Originally, the volcano observatory was known as the Long Valley Observatory which monitored volcanic activity east of the Sierra Nevada in Mono County, California which included Long Valley Caldera, Mammoth Mountain, and the Mono–Inyo Craters. In 2012, the Long Valley Observatory was integrated into the new California Volcano Observatory based in Menlo Park, California which covers the entire states of California and Nevada, this includes the southern Cascade Range volcanoes in the state of California which were previously under the jurisdiction of the Cascades Volcano Observatory. Monitored volcanoes These are the volcanoes monitored by the California Volcano Observatory, in order of highest to lowe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NPS Six Rhyodacite Lava Domes Of Chaos Crags
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depression (geology)
In geology, a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms. Types Erosion-related: * Blowout: a depression created by wind erosion typically in either a partially vegetated sand dune ecosystem or dry soils (such as a post-glacial loess environment). * Glacial valley: a depression carved by erosion by a glacier. * River valley: a depression carved by fluvial erosion by a river. * Area of subsidence caused by the collapse of an underlying structure, such as sinkholes in karst terrain. * Sink: an endorheic depression generally containing a persistent or intermittent (seasonal) lake, a salt flat (playa) or dry lake, or an ephemeral lake. * Panhole: a shallow depression or basin eroded into flat or gently sloping, cohesive rock.Twidale, C.R., and Bourne, J.A., 2018Rock basins (gnammas) revisited.''Géomorphologie: Relief, Processus, Environnement,'' Vol. 24, No. 2. January 2018. Retrieved 9 June 2020. Coll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viola, California
Viola is an unincorporated community in Shasta County, California, United States. The community is located along California State Route 44 State Route 44 (SR 44) is a state highway in the U.S. State of California that travels in an east–west direction from State Routes 273 and 299 in Redding to Lassen Volcanic National Park before ending at State Route 36 west of Susanvill ... east of Redding. References Unincorporated communities in California Unincorporated communities in Shasta County, California {{ShastaCountyCA-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tehama County, California
Tehama County ( ; Wintun for "high water") is a county located in the northern part of the U.S. state of California. As of the 2020 census, the population was 65,829. The county seat and largest city is Red Bluff. Tehama County comprises the Red Bluff, California micropolitan statistical area, which is also included in the Redding-Red Bluff, California combined statistical area. The county is bisected by the Sacramento River. Etymology The county is named for the City of Tehama. Tehama is most commonly believed to be derived from the Wintun word for "high water". Others definitions of native origin that have been proposed such as "low land", "salmon", "mother nature" or "shallow". A less accepted theory proposes the names origin is ''tejamanil'', shingle in Spanish. History Tehama County was formed from parts of Butte, Colusa, and Shasta Counties in 1856. The first permanent non-indigenous settlers in the area that is now Tehama County were Robert Hasty Thomes, Albert G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral, California
Mineral is a boundaried but unincorporated forest village in Tehama County, California, United States. It has been part of a much larger census-designated place since 1980, for which the population was 123 at the 2010 census, down from 143 at the 2000 census. History The community was named for mineral springs near the original town site. A post office at Mineral was established in 1894. Geography Mineral is located at (40.355686, -121.567333). According to the United States Census Bureau, the CDP has a total area of , of which, of it is land and of it (0.25%) is water. Climate Mineral experiences warm and dry summers and cool, snowy winters. According to the Köppen climate classification system, Mineral has a warm-summer Mediterranean climate (''Csb''). Demographics Mineral has been included in a census-designated place (CDP) bearing the village's name since 1980. Consequently, census-based information since then applies to the entire CDP, not just the village pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Forest Service
The United States Forest Service (USFS) is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands. The Forest Service manages of land. Major divisions of the agency include the Chief's Office, National Forest System, State and Private Forestry, Business Operations, and Research and Development. The agency manages about 25% of federal lands and is the only major national land management agency not part of the U.S. Department of the Interior, which manages the National Park Service, the U.S. Fish and Wildlife Service, and the Bureau of Land Management. History The concept of national forests was born from Theodore Roosevelt's conservation group, Boone and Crockett Club, due to concerns regarding Yellowstone National Park beginning as early as 1875. In 1876, Congress formed the office of Special Agent in the Department of Agriculture to assess the quality and conditions of forests in the United States. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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