The Earth's crust is broken into plates that are in constant motion over timescales of millions of years. ... This provided a focal point where the mantle underneath the plate could rapidly melt, forming magma that erupted easily through the thinned plate and onto the surface, in massive outbursts of volcanic activity.
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Answer:
true
Explanation:
The Earth's crust is broken into plates that are in constant motion over timescales of millions of years. ... This provided a focal point where the mantle underneath the plate could rapidly melt, forming magma that erupted easily through the thinned plate and onto the surface, in massive outbursts of volcanic activity.