Geologic Time Scale and Earth's History

How old is the Earth?

• 1 billion years

• 2.5 billion years

• 4.6 billion years

• 10 billion years

Which of the following correctly lists the divisions of the geologic time scale from largest to smallest?

• Eon, Era, Period, Epoch

• Era, Eon, Period, Epoch

• Period, Epoch, Era, Eon

• Epoch, Period, Era, Eon

What was the state of Earth during the Hadean Eon?

• Continents were forming and life was starting in the oceans.

• The Earth was a hot ball of rock and the Moon was forming.

• The first complex cells and multicellular organisms appeared.

• Dinosaurs roamed the Earth.

What does the term "Phanerozoic" signify in the geologic time scale?

• Early Life

• Old Life

• Middle Life

• Visible Life