Question

Rocks that are subject to great heat and pressure over long periods of time are transformed into
Answer

magma

metamorphic rocks

igneous rocks

sedimentary rocks

Answer 1

'Metamorphic rocks form deep within the Earth when heat and pressure are applied to either igneous rocks or sedimentary rocks. This heat and pressure in essence cooks the rocks, changing their structure substantially. The rocks are partially melted and the chemicals within them are rearranged so that the final rock is very different than the original rock.'

Source: http://www.kidsgeo.com/geology-for-kids/0028-metamorphic-rocks.php

Answer 2

D- reasonMinerals may get changed to other minerals forming a new rock. Mineral grains also become aligned in response to the increased pressure.