Geologic Time Scale

What is the branch of science that literally means "the study of the Earth"?

• biology

• geology

• history

• paleontology

Paleontologists infer that the earth is approximately how many years old?

• 4.5 billion years old

• 4.5 million years old

• 450 billion years old

• 450 million years old

The “calendar” for events in Earth history. It subdivides all time into units of abstract time called eons, eras, periods, epochs, and ages.

• Gregorian calendar

• Geologic time scale

• Precambrian

• Time period

Put the following units of geological time in order from largest to smallest unit of geologic time.

• eon,

  era,

  period,

  epoch

• Phanerozoic,

  Proterozoic,

  Archean,

  Hadean

• epoch,

  period,

  era,

  eon

• Hadean,

  Archean,

  Proterozoic,

  Phanerozoic

It is the Earliest Age of Earth's Geologic History and the longest as it includes approximately 80-90% of Earths Entire History.

• precambrian

• paleozoic

• mesozoic

• cenozoic

Fossils provide evidence of __________.

• how life and the environment has remained stable over time

• how the climate and weather has remained stable over time

• how life and the environmental conditions have changed over time

• how animals adapt to their changing environment

Best known as era of middle life and age of reptiles and dinosaurs.

• precambrian

• paleozoic

• mesozoic

• cenozoic

Best known as era of ancient life and the age of marine life.

• precambrian

• paleozoic

• mesozoic

• cenozoic

Which era is the most recent, the one that we are currently in?

• cenozoic

• mesozoic

• paleozoic

• precambrian

This clock represents the entire history of Earth in a 24-hour span. At what time did humans make their first appearance?

• 9:04 PM

• 8:48 PM

• 11:58 PM

• 10:56 PM