When did the Earth begin forming?

The Paleozoic Era is also know as the Age of

The Mesozoic Era is also known as the

The Cenozoic Era is known as the

What happened when temperatures decreased during the ice ages of the Cenozoic Era?

What caused a variety of life-forms to appear in the Cambrian Period.

The numeric or exact age of an object is called?

When did organisms that formed index fossils live?

Scientists have most accurately determined the absolute ages of rock layers by

The rock sample that contains mostly the daughter isotope is...

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