Energy

Is one of the least expensive sources of energy:

• Solar energy

• Water energy

• geysers

• Sound energy

Wherever water falls from a high place to a low one, it creates a lot of…

• sun

• energy

• water

• geysers

_________ Are built on rivers and lakes to use this energy. This water is sent through pipes to water turbines hundreds of meters below.

• Dams

• water

• light

• sun

The water energy that the turbines collect is used to run a _______________

• Light bulb

• refrigerator

• Generator

• fan

A __________________ is water that shoots up from the ground in the form of liquid and gas or vapor.

• lakes

• rivers

• sun

• Geyser

____________________ occurs when the sun warms the surface of Earth. Some parts of Earth absorb more heat than others.

• Moving air

• turbines

• rain

• water

Moving air is called:

• sun

• wind

• tornadoes

• hurricanes

____________________ , _______________________ are examples of strong wind.

• Tornadoes, hurricanes

• Water power, sun energy

• Water energy, light energy

• Water and air

They used wind power thousands of years ago:

• Europeans

• Egyptians

• Chinese

Can be found around the world. Like the ancient Egyptians. People use wind to push against sails and to make sailboats move across water.

• windmills

• water

• air

• geysers