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Questions and Answers
As the plates move apart, the decrease in overlying _______________ causes parts of the mantle to melt, forming magma.
As the plates move apart, the decrease in overlying _______________ causes parts of the mantle to melt, forming magma.
pressure
Magma rises through the weak areas in the crust to the Earth's surface and fills the gaps caused by spreading plates, forming _______________ volcanoes.
Magma rises through the weak areas in the crust to the Earth's surface and fills the gaps caused by spreading plates, forming _______________ volcanoes.
submarine
The decrease in overlying pressure causes parts of the underlying mantle to melt, forming _______________.
The decrease in overlying pressure causes parts of the underlying mantle to melt, forming _______________.
magma
As the subducting plate sinks into the mantle, the high-pressure forces water out of its _______________ crust.
As the subducting plate sinks into the mantle, the high-pressure forces water out of its _______________ crust.
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Water lowers the melting point of the overlying mantle, causing it to melt, form _______________.
Water lowers the melting point of the overlying mantle, causing it to melt, form _______________.
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Heat from the earth's ______ causes the mantle material to become less dense
Heat from the earth's ______ causes the mantle material to become less dense
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The rising and sinking of the mantle material forms ______ currents
The rising and sinking of the mantle material forms ______ currents
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The ______ oceanic crust sinks deeper into the mantle under its own weight, pulling the rest of the plate with it
The ______ oceanic crust sinks deeper into the mantle under its own weight, pulling the rest of the plate with it
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The age of rocks ______ to the centre of the mid oceanic ridge are the youngest
The age of rocks ______ to the centre of the mid oceanic ridge are the youngest
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When earth's ______ reverses, the rocks record the reversals
When earth's ______ reverses, the rocks record the reversals
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