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Geog3pt2

QuestionAnswer
What type of rock is formed when molten material is deposited on the Earth's surface and cooled? Igneous rock
What type of rock is formed when an existing rock is changed by heat and pressure? Metamorphic
What are the correct geologic eras from oldest to most recent? Precambrian=570 my bp Paleozoic=570-225 my bp Mesozoic=225-66 my bp Cenozoic=66 my bp
What type of rock must all rocks have originally derived from? Igneous
What type of rock usually shows stratification? Sedimentary
What is the basic idea involved in the concept of plasticity? Change in shape of crust, layers, etc., caused by pressure, temperature, etc.
What is the principle of isostasy? -Maintenance of hydrostatic equilibrium in crust -Add weight to crust it sinks -Remove weight, crust rises (rebound)
What is the basic driving force behind continental drift? Plate tectonics
What is the process of rock being absorbed back into the Earth's surface? Subduction
In an ocean basin, will the oldest rock be nearest to the mid-ocean? Yes
Where is rock absorbed back into the Earth's interior? Trenches on margins of oceans
Where in the ocean does molten material come to the surface? Divergent boundaries
What is sea-floor spreading? -Mid-ocean ridges rise from rising molten material -Molten rock spreads outwards -Material forced back into the interior at the trenches on margins of the oceans
Created by: iamerror92
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