Physical Geography Section 1

The _________ is the source of all energy on Earth.

• Human

• Sun

• Wind

Earth makes one revolution around the sun every ___________days.

• 365

• 365 1/4

• 365 1/2

The Earth spins on its axis one complete time every ______ hours.

The inside of the Earth is made up of 3 main Layers: core, mantle, and _________.

The Hydrosphere: About _____ % of Earths surface is water.

• 71

• 50

• 81

Only 3 % of water on Earth is __________.

• Salt Water

• Freshwater

• Frozen

The Lithosphere: Only about _____ percent of Earth’s surface is land.

• 29

• 33

• 14

The Atmosphere: is made up of about 78% Nitrogen, 21% __________, and small amounts of other gases.

• Hydrogen

• Carbon Dioxide

• Oxygen

The Biosphere: is made up of all that is ________ on the surface of the earth.

Earth is tilted ________ degrees on its axis.

• 25

• 11

• 23.5