on April 15, 2022
How big is the Columbia Plateau?
GeologyHow long is the Columbia Plateau? about 250 miles In a river basin that is mostly mountains and steep valleys, the Columbia Plateau is an area of flat land and gently rolling hills cut by the sometimes steep river canyons of the Columbia and its tributaries. It is a roughly triangular-shaped area about 250 miles
on April 15, 2022
What are the three primary minerals found in granite?
GeologyGranite is a light-colored plutonic rock found throughout the continental crust, most commonly in mountainous areas. It consists of coarse grains of quartz (10-50%), potassium feldspar, and sodium feldspar. These minerals make up more than 80% of the rock. What are the major minerals in granite? The most essential mineral constituents of granite are 20–40%
on April 15, 2022
Is hornblende an amphibole?
Geologyhornblende, calcium-rich amphibole mineral that is monoclinic in crystal structure. What is the difference between hornblende and amphibole? is that amphibole is (geology) a large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium/aluminum while hornblende is a green to black amphibole mineral, of complex structure,
on April 15, 2022
How volcanoes are formed using the theory of plate tectonics?
GeologyOn land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle. Does the theory of plate tectonics explain where volcanoes are located? The theory of plate tectonics explains most of the
on April 15, 2022
What are the most common Precambrian fossils called?
GeologyCommon Precambrian fossils include mats of algae called stromatolites, microorganisms, and simple animals. What is the most common Precambrian fossils? The most common Precambrian fossils are stromatolites. Stromatolites are distinctively layered mounds or columns of calcium carbonate. They are not the remains of actual organisms but are the material deposited by algae. Many of these
on April 15, 2022
What minerals are found in Illinois?
GeologyMajor industrial minerals produced in Illinois today are crushed stone (limestone and dolomite), sand and gravel, clay, silica sand, tripoli (microcrystalline quartz), and peat. Portland cement, lime, and brick are also manufactured. What precious stones can be found in Illinois? A wide variety of rocks and minerals can be found in the area including agate,
on April 15, 2022
What was on Earth a billion years ago?
GeologyAlthough the division between a colony with specialized cells and a multicellular organism is not always clear, around 1 billion years ago, the first multicellular plants emerged, probably green algae. Possibly by around 900 Ma true multicellularity had also evolved in animals. Was there life 1 billion years ago? The earliest time that life forms
on April 15, 2022
Can nukes cause tsunamis?
GeologyWould a nuke cause a tsunami? 3,700 test explosions were conducted over a seven-month period. The tests revealed that a single explosion would not produce a tsunami, but concluded that a line of 2,000,000 kg (4,400,000 lb) of explosives about 8 km (5.0 mi) off the coast could create a destructive wave. What would happen
on April 15, 2022
What is a scratch test for rocks?
GeologyAbstract The scratch test is a non-destructive method made up of pushing a tool across the surface of a weaker rock at a given penetration depth. What does the scratch test do? A skin prick test, also called a puncture or scratch test, checks for immediate allergic reactions to as many as 50 different substances
on April 15, 2022
What is the difference of P wave and S wave?
GeologyP waves can travel through any media (including liquid and gas), but S waves can only travel through solid media like rock. P waves travel faster than S waves. The difference in travel times can be used to determine the epicenter of the earthquake. What are three differences between P and S waves? Body waves