is crater lake a shield volcano?
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The spectacular 8 x 10 km Crater Lake caldera in the southern Cascades of Oregon formed about 7,700 years ago as a result of the collapse of a complex of overlapping shield and stratovolcanoes known as Mount Mazama.
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Although it is commonly believed that Lake Tahoe is volcanic in origin, the Lake Tahoe Basin was actually formed by geologic block faulting 25 million years ago. ... Several active volcanoes poured lava into the basin, eventually damming the outlet near the present town of Truckee.
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Penalties apply. Camping, including sleeping in campervans and vehicles, is not permitted in Crater Lakes National Park. Domestic animals are prohibited in national parks.
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Six months after the start of the 2002 eruption, Nyiragongo volcano erupted again. Activity at Nyiragongo is ongoing, but currently confined to the crater, where another lava lake has formed about 250 metres below the level of the 1994 lava lake.
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Shield volcanoes are found on divergent plate boundaries , where two plates move away from one another. Shield volcanoes have the following characteristics: Basaltic magma, which is high in temperature, very low on silica and with low gas content.
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This volcano only slowly flows lava from its crater, and forms so called "ropes of cooled lava". The cinder type looks like a medium-sized cone inverted. ... One example of that is Taal Volcano, a small volcano located in an island at Batangas, Philippines.
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At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world.
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Over 1 billion years ago, lava flowed through in the area we now know as Lake Superior. As the lava cooled, air pockets filled with mineral rich water, depositing layers of chalcedony quartz that hardened together to form agates.
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Cinder cone volcanoes are relatively small, rarely exceeding 1,000 feet tall. Composite volcanoes, also known as stratovolcanoes, are towering structures, often rising more than 10,000 feet. Shield volcanoes are broad, typically 20 times wider than they are high. These volcanoes can be massive.
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Mount Meager volcanic complex, of Pliocene-to-Holocene age, forms a dissected andesitic-to-rhyodacitic stratovolcano with multiple eroded summit lava domes and volcanic necks. It lies in the Garibaldi volcanic belt and is the northernmost volcano of the Cascade arc that extends to northern California.
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Mount Elgon is an extinct shield volcano on the border of Uganda and Kenya, north of Kisumu and west of Kitale. ... Although there is no verifiable evidence of its earliest volcanic activity, geologists estimate that Mount Elgon is at least 24 million years old, making it the oldest extinct volcano in East Africa.
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US-based volcanologist Jess Phoenix says Taal has "a history of multiple eruption styles", so it creates threats on the ground in the form of lava and in the air through ash. There's also the risk of a "volcanic tsunami", she adds, which can be trigged by falling debris after an eruption generating waves in the lake.
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The main parts of a volcano include the magma chamber, conduits, vents, craters and slopes. There are three types of volcanoes: cinder cones, stratovolcanoes and shield volcanoes.
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Mount Cleveland, also known as Cleveland Volcano and Chuginadak, is one of the most active volcanoes in the central part of the Aleutian island arc. It is a stratovolcano that comprises the entire western half of Chuginadak Island.
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Magma composition determines both eruption type and volcano type. Composite cones are built of felsic to intermediate lava and shield volcanoes of mafic lava. Cinder cones are made of small fragments of a variety of compositions usually from a single eruption.
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A volcanic crater can be of large dimensions, and sometimes of great depth. During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.
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Composite volcanoes are tall, steep cones that produce explosive eruptions. Shield volcanoes form very large, gently sloped mounds from effusive eruptions.