The formation of magma within the mantle and crust requires a greatamount of heat. Much of this heat comes from the radioactive decay ofelements such as uranium, thorium, and potassium. Due to the process ofradioactive decay, the heat produced early in the Earth’s history wasgreater than that currently produced. The heat produced today is greaterthan will be produced in the future. How might the chemistry anddistribution of igneous rocks change in the future? Would you expectmore or fewer volcanoes? Why? Share your thoughts and theories with yourclassmates.
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