Geologic Timescale Review

Earth's entire history is divided into units of time called the

• Earth Time Scale
• Geologic Time Scale
• Geologic History Scale
• Earth History Scale

Which unit of the Geologic Time Scale is the longest amount of time?

• Era
• Period
• Eon
• Epoch

Eons are divided into

• Periods
• Eras
• Epochs

The shortest units of time on the Geologic Time Scale are

• Periods
• Eons
• Eras
• Epochs

Eras are  divided into smaller units called

• Eons
• Eras
• Periods
• Epochs

The earliest time period in Earth's history is called

• Cambrian Period
• Phanerozoic Eon
• Holocene Epoch
• Pre-Cambrian 

True or False:  Geologic Time has ended.

• True
• False

Present day Earth is in the ____ epoch?

• Holocene
• Pleistocene
• Miocene
• Paleocene

Present day Earth is in the ____ era.

• Cenozoic
• Mesozoic
• Paleozoic

The _____ period is important because a variety of living things evolved during this time.

• Cambrian
• Cretacious
• Jurassic
• Quaternary