what do scientists use to divide the geologic time scale? (a) major divisions in the fossil. (b) records major divisions in the sedimentary rock layers. (c) evidence for catastrophic events in earth's history. (d) major changes in mineral deposits in the rock layers.

Try evidence for catastrophic events in earths history

A metamorphic rock.

Explanation:

The metamorphic rocks are transformed from the existing rock types. They change with the changes in pressure and temperature. They cover large parts of the earth's crust make up 12% of the earth. They are made by tectonic processes such as continental collision. That leads to horizontal pressure and distortions some examples may include the gneiss, marble, slate, schist, and quartzite.