Geologic Time

How long ago did the Earth form?

• 46 million years ago

• 4.6 million years ago

• 4.6 billion yeas ago

• 46 billion years ago

Dinosaurs and Humans were on Earth at the same time

• true

• false

Life was on land BEFORE it was in water.

• true

• false

There have been many mass extinctions throughout Earth's long history.

• true

• false

In geologic time, this is the largest division of time

• epoch

• period

• era

• eon

______ takes up about 88% of Earth's history, and is split into the Hadean, Archean, and Proterozoic.

• Cambrian

• Precambrian

• Ordovician

• Phanerozoic

This is the correct division of time from LARGEST to SMALLEST

• eon, era, period, epoch

• epoch, period, era, eon

• eon, epoch, period, era

• era, period, eon, epoch

This era is marked by the existence of dinosaurs.

• Paleozoic

• Mesozoic

• Cenozoic

This era is marked by the rise of humans

• paleozoic

• mesozoic

• cenozoic

Why don't we know much about what Earth was like during the Precambrian?

• Because nothing was going on

• Because there is no evidence of what happened

• Because Earth was changing too fast