Geological Timescale

How old is the Earth?

• approximately 2.5 million years old

• approximately 4.6 billion years old

• 156000 years old

• 4.8 million years ol

Tags

NGSS.MS-ESS1-4

The biggest time period into which scientists have divide the time between the formation of the Earth and now is called:

• periods

• epochs

• eons

• eras

Tags

NGSS.MS-ESS1-4

Scientists were able to estimate the age of the Earth by studying:

• trees

• the stars

• fossils

• rocks

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

Look at the diagram.

What are eons divided into?

• eras

• epochs

• periods

Tags

NGSS.MS-ESS1-4

Look at the diagram.

Which era do we live in?

• phanerozoic

• neogene

• cenozoic

Tags

NGSS.MS-ESS1-4

Look at the diagram.

How long ago did the Mesozoic era begin?

• 542 million years ago

• 250 million years ago

• 65 million years ago

Tags

NGSS.MS-ESS1-4

The Cambrian explosion was:

• an explosion of asteroids that destroyed all life on Earth, including dinosaurs

• a huge volcanic eruption that destroyed all life on Earth

• an explosion of multi-cellular life

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Dinosaurs lived in this era.

• Mesozoic

• Cenozoic

• Paleozoic

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Why are rocks moving all the time?

• because they want to

• because of the movement of the tectonic plates

• because of supernatural phenomena

Tags

NGSS.MS-ESS2-3

Which Layer is the oldest?

• A

• X

• G

• Z

Tags

NGSS.MS-ESS1-4