Geologic Time

What are fossils?

• the oldest layers of rock in a region

• objects that people of long ago left behind as artifacts

• the remains or traces of an organism preserved from the

  geologic past

• living creatures with habitats in or around rock

As millions of years went by, life became less complex.

• True

• False

Global catastrophes like a huge volcanic eruption or asteroid crashing into the earth can cause

• evolution to stop

• solar and lunar eclipses to multiply

• mass extinctions

• temperature of the earth to stay constant

The oldest rocks on Earth are __________.

• 3.5 million years old

• 3.5 billion years

• 1.6 to 1.8 million years old
• 1 to 2 billion years old

What is the most popular hypothesis of the formation of the moon? 

• The moon passed very close to the earth and was caught in its gravitational pull.
• The moon formed the same time as the earth.
• The moon formed when a small planet smashed into the newly formed earth sending debris into space which formed the moon.

The earth and moon were formed during which of the following eons?

• Proterozoic
• Hadean
• Archean
• Phanerozoic

How old is the Earth?

• 4.6 billion years
• 4.4 million years
• 6.5 billion years
• 2017 years

The first three era's of time are collectively known as?

• Cambrian

• Precambrian

• Hadeon

• Archaeon

When did the earliest life single celled life appear on Earth?

• Hadeon

• Archaeon

• Proterozoic

• Cenozoic

Identify the Eon where the event described occurred:

Oxygen production

• Hadean

• Archaean

• Proterozoic

• Phanerozoic