Earth's Resources

Water-bearing layers of rock, sand, or gravel.

• aquifirs
• hydroelectric
• aqueduct
• desertification

What is the thickest layer of the Earth?

• crust
• mantle
• outer core
• inner core

Water on Earth is either freshwater or saltwater. What is the percent ratio of freshwater to percent saltwater on Earth?

• 1% freshwater : 99% saltwater

• 3% freshwater : 97% saltwater

• 30% freshwater : 70% saltwater

• 50% freshwater : 50% saltwater

When water goes from being a gas (water vapor) to a liquid, that process is called 

• Condensation
• Evaporation
• Transpiration
• Precipitation

Why is the Inner Core solid?

• Extreme Heat
• High Pressure
• All the layers are solid
• It's made of rock

Temperature _____________________ as you go deeper into the earth.

• increases
• decreases
• goes up and down depending on the layer
• stays the same

What is the correct order (starting from the surface) of Earth's layers?

• crust, mantle, inner core, outer core
• mantle, outer core, inner core, crust
• inner core, outer core, mantle, crust
• crust, mantle, outer core, inner core

A layer of air that surrounds Earth to keep us warm is called ...

• atmosphere
• Sun's rays
• ozone layer
• air pressure

In what layer would you find the ozone layer?

• troposphere
• stratosphere
• mesosphere
• thermosphere

What gas makes up the majority of the atmosphere?

• oxygen

• nitrogen

• water vapor

• carbon dioxide