What is the energy of motion called?

What is the direct and indirect source of most energy resources?

When a person rubs his hands together on a cold day, friction is being used to convert

Heated air moves from hot-air vents to the rest of a room in a process called

Besides water vapor, what must be present for clouds to form?

A carbon dioxide (CO2) molecule is made up of

Because burning fossil fuels creates much pollution, alternatives are being investigated. What might limit the use of wind as a major resource?

Which is the chemical break-up of H2O?

Which is not a fossil fuel?

Uneven heating of the air near Earth's surface causes

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