What is the name of the scale used to organize events in the Earth's history?

What is the largest grouping on the geologic timescale?

Approximately how old is Earth?

What determines when a period starts or ends on the geologic timescale?

Which period are we currently in?

Which era are we currently in?

Most of Earth's history occurred in what eon?

What eon are we currently in?

When reading a geologic time scale, which area on the scale represents the oldest time in history?

Which of the following has the categories of the time scale in order from largest to smallest?

What are the three eras in order from youngest to oldest?

Which of the following is not a period on the geologic time scale?

A species completely wiped out is a(n)

When 50% or more of species on Earth go extinct in a short period of time.

Which mass extinction is known as The Great Dying?

Which of the following is not a cause of mass extinction?

Good can come from mass extinctions even though organisms are wiped out.

Mass extinctions are the only cause of a period stopping and a new period starting on the geologic time scale.

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