Explanation:

Metamorphic rocks form under the action of pressure, volume and temperature (PVT) changes.
Metamorphism occurs when rocks are forced down to lower levels by tectonic processes or when molten
magma rising through the crust comes in contact with the crustal rocks or the underlying rocks are
subjected to great amounts of pressure by overlying rocks. In Metamorphism consolidated
rocks undergo recrystallization and reorganization of materials within original rocks.
• In the process of metamorphism in some rocks grains or minerals get arranged in layers or lines. Such an
arrangement of minerals or grains in metamorphic rocks is called foliation or lineation. Sometimes
minerals or materials of different groups are arranged into alternating thin to thick layers appearing in
light and dark shades. Such a structure in metamorphic rocks is called banding and rocks
displaying banding are called banded rocks.
• Metamorphic rocks have been put under great pressure, heated, squashed or stretched. So fossils do not
usually survive these extreme conditions. Generally it is only sedimentary rocks that contain fossils.