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Ch1L3
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How much do plates move in a year?
About 1-12 cm
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What is a fault?
A break in the Earth's crust where rocks have slipped past each other
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When pieces of Earth's crust diverge on land, what landform forms?
Rift valley
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What happens at a divergent boundary?
Plates move apart
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What does the theory of plate tectonics state?
Earth's plates are in slow, constant motion driven by convection currents in the mantle
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What happens at convergent boundaries between continental crust and oceanic crust?
The more dense oceanic crust sinks beneath the less dense continental crust
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What causes plates to move?
Convection currents in the mantle
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What can occur when two plates suddenly slip past each other at a transform boundary?
Earthquakes
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What happens when two plates carrying continental crust collide?
Mountain ranges are formed
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What happens at a convergent boundary?
Plates move together
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What are plates?
Pieces of the Earth's crust
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What is convection?
The cycling of material due to changes in density caused by changes in temperature
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Where do most divergent boundaries occur?
Mid-ocean ridges
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What happens at transform boundaries?
Plates slip past one another
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