What is the center of our solar system?

• Earth

• Sun

• Galaxy

• Moon

The Earth rotates or spins on its _____ as it orbits the sun.

• Pole

• Revolution

• Core

• Axis

The earth completes one rotation every 24 hours which is what we consider a _____

• Week

• Revolution

• Day

• Month

How many days does it take the earth to make one revolution (complete trip around the sun)?

• 365 ¼

• 368 ½

• 350 ¾

• 375 ¼

What is the correct order of the Earth's layers from its center to the surface?

• Crust, Mantle, Core

• Core, Mantle, Crust

• Core, Crust, Mantle

• Mantle, Core, Crust

What percentage of the Earth's surface is water?

• 63%

• 29%

• 82%

• 71%

What percentage of the Earth's surface is land?

• 19%

• 71%

• 29%

• 36%

What percentage of the water on earth is freshwater?

• 3%

• 7%

• 9%

• 97%

What percentage of the water on earth is salt water?

• 90%

• 97%

• 3%

• 85%

Which of the Earth's physical systems is described as thin layer of gases that envelop the Earth (Air we breath is part of this)?

• Hydrosphere

• Lithosphere

• Atmosphere

• Biosphere