Earth's History

The geologic time scale is divided up 4 large units of time called:

• Eons

• Eras

• Periods

• Epochs

Tags

NGSS.MS-ESS1-4

The oldest eon is called:

• Proterozoic

• Paleozoic

• Hadean

• Archean

Tags

NGSS.MS-ESS1-4

The Phanerozoic Eon is divided into ____________ eras?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ESS1-4

Approximately how many years ago did Earth form?

• 460 years

• 460,000 years

• 4.6 million years ago

• 4.6 billion years ago

Tags

NGSS.MS-ESS1-4

How would you describe Earth 4 bya?

• hot

• covered in molten rock

• devoid of oxygen

• all of the above

What were the earliest life forms on Earth?

• simple, multicellular organisms

• unicellular plants

• photosynthesizing bacteria

• anaerobic bacteria

Tags

NGSS.MS-LS4-1

When did the earliest life forms emerge on Earth?

• 4.5 bya

• 3.8 bya

• 2.5 bya

• 550 mya

Tags

NGSS.MS-LS4-1

What life forms were responsible for introducing oxygen to Earth's atmosphere?

• the very first life forms

• Cyanobacteria

• the first multicellular organisms

• the first land plants

Tags

NGSS.MS-LS1-6

Which was the last life form to emerge on Earth?

• insects

• reptiles

• flowers

• humans

What is a mass extinction?

• The emergence of new life species to appear in a short time period.

• The emergence of very large species.

• The loss or death of a large species.

• The loss or death of many different species in a short time period.

Tags

NGSS.MS-LS4-1