Thursday, February 8, 2018

A New Era

What major changes do scientist use to divide up geological time? 

Geological Time Brain Pop



15 comments:

Anonymous said...

extinctions

Anonymous said...

They use major extinctions are massive changes and diversity of life. For example the Cambrian explosion which signaled the end of the Precambrian.

Brandon.G. said...

Scientist use major extinctions.

stella said...

Scientists use major extinctions

MattyC said...

Extinctions

Allie Nichols said...

They use major extinctions.

Kaitlyn said...

major extinctions

Dylan .l said...

Scientists use major extinctions

Kailey Clark said...

The scientists use major extinctions

Ashley Stanton said...

They use major extinctions and major changes to the Earth.

Amelia M said...

Major extinctions and major geographigal changes

Luke R said...

extinctions

Anonymous said...

Major extinctions.

Carson R. said...

Scientist use types of fossils and the age of rocks.

Anonymous said...

extinctions