The Principles of Stratigraphy Are Often Used to Determine the Relative

Multiple Choice

The principles of stratigraphy are often used to determine the relative ages of fossils.Which statement is an important assumption of this method?

A) The decay rate of a radioactive substance is constant.
B) The decay rates of different radioactive substances are different.
C) The sedimentary rocks in which the fossils have been found have been disturbed.
D) The sedimentary rocks in which the fossils have been found have not been disturbed.
E) The fossils are in igneous rocks.