Geologists have recently determined that Earth is approximately (or about):

Eons are chunks of time that last:

Epochs are chunks of time that last:

Periods are chunks of time that last:

Eras are chunks of time that last:

Measurement of radioactive elements in rocks:

What is the half-life of a radioactive element?

We learn, in Geology, that which of the following comes first?

When did plants first colonize land?

Relative dating methods are used to determine:

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