The OrIgin of Life On Earth

Unit 9

History of life on Earth..........................

Objective

Earth in Space and time. The student knows that fossils provide evidence for geological and biological evolution.

How life began on Earth and why?

• No one knows how or why life began.

  We do know that life on Earth started at least 3.8 billion (3 800 000 000) years ago.

• By this time, the young planet had cooled and formed a rocky crust.

• Some scientists believe life began in a rock pool or in the ocean.

• Others think it may have arrived from space with comets and asteroids.

#1 Quiz

You will answer questions on your quiz from this video.