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19 Cards in this Set
- Front
- Back
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Contintental crust- ________ dense, ________ (thinner or thicker), mainly composed of________
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less, thicker, granite
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Oceanic Crust- ________ dense, _______ (thinner or thicker), mainly composed of ________
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more, thinner, basalt
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How is the Earth divided into layers?
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Based on density and composition
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What are the layers of the Earth?
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Inner core, outer core, mantle, crust.
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Does crust has a higher or lower density of all the other sections of the earth?
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Lower
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What part of the earth are plates in?
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They're in the lithosphere
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What is the mechanism of plate movement, and where is it in the earth?
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Convection currents in asthenosphere are mechanism of plate movement
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What do you need to be properly prepared for earthquakes and volcanoes?
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You need to store water, first aid kits, food, clothing and to secure unstable objects like shelves and cabinets.
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What is a hot spot?
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A hot spot is a plume of rising magma that forms volcanoes withing the middle of a plate.
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Name 4 pieces of evidence of continental drift.
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Matching fossils, continent shapes, matching mountain ranges, and earthquake patterns match plate boundaries.
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What do ocean/ocean convergent boundaries form?
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Volcanoes and trenches
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What do ocean/continent boundaries form?
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trenches, volcanoes, and mountains
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What do continent/continent convergent boundaries form?
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mountains
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What happens at subduction zones?
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Earthquakes are deeper as the plate sinks deeper below the over-riding plate because it is less dense.
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Where do transform earthquakes occur?
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Shallow zones
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Do rocks and islands increase or decrease in age farther from the hot spot?
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Increase
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What are the three types of volcanoes?
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Composite/strato-volcano, cincer cone and shield volcano
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What is the driving force of convection?
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Unequal distribution of heat within the mantle.
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Where does seafloor spreading occur?
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It occurs at mid ocean ridges.
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