One Important Reason We Do Not Know Much About the Geologic

Multiple Choice

One important reason we do not know much about the geologic history of the Precambrian is that ________.

A) rocks did not exist during much of that time
B) the climate was so harsh that erosion removed most of the rocks that formed during the Precambrian.
C) radioactivity was not measurable during the Precambrian
D) we have not yet been able to establish the half-lives for radioactive elements that existed in the Precambrian
E) there are very few fossils preserved in Precambrian rocks