trench when two plates of oceanic crust collide, one plate sinks beneath the other. one of the...
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Trench
• When two plates of oceanic crust collide, one plate sinks beneath the other.
• One of the plates is pushed beneath the deep-sea trench down toward the mantle.
• A deep-ocean trench may form where oceanic crust sinks toward the mantle beneath continental crust. Some of the oceanic crust melts to form magma.
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Volcanic Islands Beneath the trench, the plate melts
and becomes magma.
The magma erupts to the surface forming a row of volcanic islands.
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Mid-Oceanic Ridge Sea-floor spreading occurs as oceanic
plates pull apart along the mid-oceanic ridge.
A mid-ocean ridge is a mountain range that winds through Earth’s oceans.
Lava erupts through narrow cracks along the ridge, adding new rock to the ocean floor.
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Rift Valley
A rift valley forms when two pieces of continental crust pull apart.
Over millions of years, the rift valley could widen and sink below sea level, forming a new ocean.
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Earthquakes
When two plates slide past each other, moving slowly in opposite directions, earthquakes can occur.
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Mountains If two plates carrying continental crust collide, neither
plate sinks beneath the other.
Instead, the plates slowly fold and pile on top of each other, forming a mountain range.
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