Why have many Precambrian rocks remained unchanged for billions of years?
A)They are so old that they have not had time to move past the first stage.
B)They are protected within the interiors of the continents.
C)They are only found in Antarctica and thus are not exposed to erosion.
D)They are metamorphic rocks that are too hard to be transformed.

Question

Quizplus · Accepted Answer

Precambrian rocks are often found deep within the interiors of continents, in areas where they are protected from the erosive forces of wind, water, and ice. Without exposure to these processes, the rocks remain relatively unchanged, even over billions of years. Additionally, many Precambrian rocks are metamorphic and have been transformed by heat and pressure, making them more resistant to further change.

Why Have Many Precambrian Rocks Remained Unchanged for Billions of Years