Why do igneous and sedimentry rocks sometimes get change What are the new rocks called Give example - Social Science - Inside Our Earth

Question

Why do igneous and sedimentry rocks sometimes get change?What are
the new rocks called?Give example

Madhumita Das · Accepted Answer

If the original igneous and sedimentary rock is subjected to heat
(greater than 150 degree Celcius) and pressure (greater than 1500
bars), it changes into new a new type of rock The new rock type is
called metamorphic rock Examples are change of granite into gneiss
and the change of shale into slate

Why do igneous and sedimentry rocks sometimes get change?What are the new rocks called?Give example.