What force pulls water from high ground to low ground?

• Magnetism

• Electricity

• Gravity

• Friction

What do water wheels use to turn and work?

• The energy of moving water

• The power of the wind

• The heat from the sun

• The strength of animals

What do turbines do in a hydropower plant?

• Turn generators to make electricity

• Catch fish

• Clean the water

• Build dams

How much of the United States' electricity comes from hydropower dams?

• About 6 percent

• About 50 percent

• About 25 percent

• About 1 percent

What do we call the energy that we get from the sun?

• Solar energy

• Wind energy

• Water energy

• Electric energy

What is the sun made of?

• A giant ball of gas

• A giant ball of water

• A giant ball of rock

• A giant ball of ice

What is one reason scientists are interested in solar energy for the future?

• It is a limited resource.

• It could become a major source of energy.

• It is only used for toys.

• It is not clean.

Why will we never run out of wind energy?

• Because the sun will always shine

• Because wind turbines are very big

• Because wind is stored underground

• Because wind is made by people

Where are good places to capture wind for energy?

• Areas near water and mountain passes

• Deep forests

• Underground caves

• Deserts only

What is one advantage of placing wind turbines in the ocean?

• It does not disrupt fishing

• It makes the ocean warmer

• It uses more fuel

• It is easier to build