Test: Development of Earth - Nicholas Meyer | Library

4

After Earth's formation 4.6 billion years ago, several processes kept the surface hot and molten (liquid)..Match the correct term to their description or picture.

Draggable item		Corresponding Item
radiation		Extraterrestrial comets, asteroids, meteorites hitting Earth produced heat
accretion		Planet attracts matter, gets big and gravity compresses planet, producing heat
Bombardment from space material		Denser (heavier) elements settle into layers producing heat
differentiation		Earth's core produces heat from radioactive decay

2

Re-order Earth's atmospheres from earliest (first) to present

formation of water vapor and ammonia from volcanic outgassing as well as carbon dioxide
water vapor and oxygen present; sun has formed ozone and nitrogen
Light, simple elements present get 'blown away' by solar winds

1

This type of organism produced much of Earth's early oxygen.

1

Match the description to the picture

Which of Earth's two types of crust is the densest (heaviest)?

1

How long ago did Earth form?

4

Which sphere describes all of Earths water? _______ 
Which sphere describes all of Earths rock and deeper layers? _______ 
Which sphere describes all living things? _______ 
Which sphere describes all the gases surrounding Earth?_______ 

1

Which layer is solid iron

1

The sudden increase in diversity of animals is known as?

1

Aluminum is not a dense metal...it is very light. We will likely find more aluminum in the __________

3

During the __________period, all the continents were connected. You can see our 7 continents  in the __________period. The continents first started rifting (seperating) during the __________period.