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Because of the permanent heat transfer from the hot basaltic magma chambers to the surrounding crustal rocks, increasing amounts of explosive acidic magmas develop.
Continental crustal material is generally too light to be subducted to great depth.
The continental crustal material generated in this fashion has a low specific weight and remains at the outer rind of the Earth and is not reintegrated into the mantle.
Crustal structures originally formed at depth are subse- quently uncovered by erosion.
Crustal shortening occurs across the entire magmatic zone, which in turn has an effect on the magmatism itself.
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