on April 15, 2022
What type of lava does Yellowstone have?
GeologyThe most likely type of volcanic eruption at Yellowstone would produce lava flows of either rhyolite or basalt. Does Yellowstone have basaltic lava? Basalt lava flows, though in lesser volume than rhyolites, have erupted throughout the 2.3 million-year volcanic history of the Yellowstone area. The magma feeding these eruptions originated in the upper part of
on April 15, 2022
What causes a rockslide?
GeologyA rockslide is a type of landslide caused by rock failure in which part of the bedding plane of failure passes through compacted rock and material collapses en masse and not in individual blocks. Note that a rockslide is similar to an avalanche because they are both slides of debris that can bury a piece
on April 15, 2022
When did the Missoula Floods occur?
GeologyBetween 15,000 and 13,000 years ago Glacial Lake Columbia (west) and Glacial Lake Missoula (east) are shown south of Cordilleran ice sheet. The areas inundated in the Columbia and Missoula floods are shown in red. Date Between 15,000 and 13,000 years ago Location The current states of: Idaho, Washington, and Oregon Cause Ice dam ruptures
on April 15, 2022
What is catastrophism and why is it relevant for the theory of evolution?
Geologycatastrophism, doctrine that explains the differences in fossil forms encountered in successive stratigraphic levels as being the product of repeated cataclysmic occurrences and repeated new creations. This doctrine generally is associated with the great French naturalist Baron Georges Cuvier (1769–1832). How did catastrophism contribute to evolution? Cuvier recognized these gaps in the fossil succession as
on April 15, 2022
What is a solid substance that is composed of minerals?
Geologyrock. hard substance composed of one or more minerals. igneous. rock formed from molten lava. sedimentary. What is a solid substance made of minerals? “Ores” are naturally occuring substances that are the moixtures of minerals formed by the Earth. What is an example of a solid mineral? Examples include quartz, feldspar minerals, calcite, sulfur and
on April 15, 2022
Where can you find obsidian rock?
GeologySome of the best-known occurrences of obsidian are at Mount Hekla in Iceland, the Eolie Islands off the coast of Italy, and Obsidian Cliff in Yellowstone National Park, U.S. Most obsidian is found in association with volcanic rocks and forms the upper portion of rhyolitic lava flows, though it can also occur as thin …
on April 15, 2022
What is the definition of reverse fault?
GeologyWhat is the definition reverse fault? Definition of reverse fault : a geological fault in which the hanging wall appears to have been pushed up along the footwall. What is a reverse fault kid definition? A reverse fault (if steeply dipping) or thrust fault (if shallowly dipping) is a fault where the fault plane dips
on April 15, 2022
Which city is located on the Allegheny Plateau?
GeologyThe largest city is Binghamton, New York at 47,000.…Spatial data. Dataset name Definition mines Point locations of all mines in the ecoregion. pcs Point sources of pollution: Permit Compliance System used in aquatic condition analysis. roads Roads in the ecoregion. What cities are located on the Allegheny Plateau? Larger cities in the ecoregion Pittsburgh, Pennsylvania
on April 15, 2022
Is quartzite a slate?
GeologyIs quartzite the same as slate? Quartzite can be cleft like slate, or can be smooth and more similar to marble and granite in appearance. The major difference between slate and quartzite is quartz-ite’s ability to withstand many freeze-thaw cycles. Is slate a quartzite rock? Slate is a fine-grained, foliated metamorphic rock that is created
on April 15, 2022
How are pyroclastic flows formed?
GeologyMost pyroclastic flows form by collapse of an eruption column, collapse of a dense slug of debris erupted just a few hundred meters above a vent, or collapse of the toe of a lava flow or dome growing on a steep slope. How are most pyroclastic flows generated? Pyroclastic flows are the most deadly of