Metamorphic rocks usually do not undergo further change when they are brought back to the surface.

The rocks underwent considerable folding during the Carboniferous period.

The scientists hypothesize that the crumbly rock also started clean and gray, but underwent chemical transformations, perhaps from water.

As the scientists reconstructed events, the rock underwent its last heating and cooling four billion years ago.

But let's not ignore the fact that, despite this, rock has been undergoing a certain process of feminisation over the last couple of years.

These rocks therefore underwent Fe-metasomatism (see thin section at left).

As you know, any rock may undergo radioactive aging as its natural elements break down and become other elements.

Mark thought he could see the rock itself undergoing temporary change, wherever Draffut touched it, starting to flow with the impulses of life.

There are two main types of deformation which rocks undergo and both are pertinent to landslides.

However, if a rock undergoes brittle deformation and breaks into pieces, a landslide is much more likely to occur.