The age of an object in relation to the ages of other objects is

Carbon films are

How many half-lifes would be necessary for a sample of parent isotopes to decay to the point that only 1/8 of the sample is composed of parent isotopes?

The most common Precambrian fossils are

The division of geologic time that makes up 88% of Earth's history is called

Dinosaurs became extinct at the end of the

Fossilized dung or waste is called

The unit of geologic time into which a period is divided

The fossilized remains of an organism found in very dry places are called

The gradual development of new organism from preexisting organisms is called

The first period of the Mesozoic Era is called the

Younger layers of undisturbed sedimentary rock are above older layers according to

Almost all fossils are discovered in

Organisms that formed index fossils

The Precambrian rock record is difficult to interpret because

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

The numeric age of an object is called

The Pliocene Epoch began about 5.3 MYA, or

The end of the Permian and Cretaceous Periods were marked by

A table that outlines the development of Earth

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