Question

what would happen if igneous rock was first exposed to energy from the sun and then millions of years later to energy from Earth's interior?

Answer 1

If an igneous rock is exposed to the sun for millions of years it becomes brittle. ... This would ultimately go breaking down the rocks over time turning it from igneous rock to sedimentary rock that is all small broken pieces of the igneous rock. This entire process would take millions of years to occur.