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16 Cards in this Set
- Front
- Back
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What are plates?
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Jagged pieces of earth's surface that carry continents, ocean floors or both
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What is a plate boundary?
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a line where edges of the Earth's plates meet
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What are faults?
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breaks in earth's crust where rocks have slipped past eachother
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What is a rift valley?
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deep valley that forms where 2 plates pull apart
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What is a divergent boundary and what forms?
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This is how plates move or pull apart or diverge. What forms is mid-ocean ridges or rift valleys
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What is a transform boundary?
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This happens when plates slide past eachother in opposite directions. This is how earthquakes occur
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What is a convergent boundary?
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This happens when 2 plates push together or converge. They collide and a deep ocean trench or a mountain range forms
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What happens when 2 plate collide? What plate comes on top?
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The density (weight) of the plates determines which one comes on top. When an oceanic plate collides with a continental plate, the oceanic plate goes under
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subduction
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2 oceanic plates collide- the less dense dives under
an oceanic collides with continental- the oceanic goes under |
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What are the evidence of continental drift?
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1- Land features- mountain ranges linedup as puzzle pieces
2- Fossils found on different continents 3-climate- tropical plants fossils are found in cold locations |
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Who ia Alfred Wegener and what is is thoery?
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He founded the theory of Continental drift - when , broke apartone supercontinent Pangaea
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What happens when an oceanic plate converges with an oceanic plate
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sudbduction, with the heavier plate diving under to the mantle.
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What happens when an oceanic plate and a continental plate converge?
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The oceanic plate plunges under the continental crust
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What happens when 2 continental plates converge?
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Plates crash and squeeze crust into a mountain. NO SUBDUCTION
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What is the Theory of Plate Tectronics?
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The earth's plates move because of convection currents in the mantle and subduction of the earth's plates
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Why did scientists reject this theory?
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Beacues Wegener could not provide a satisfactory explanation for the force that pushes or pulls the continents.
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