If you cannot remove a metal cap from a glass jar, it might be helpful to place the cap under hot water. Which of the following supports this advice?

Complete the statement: Cooling is to contracting, as heating is to

The change in phase from gas to liquid is called

Water releases energy when it changes phase from

On a clear summer night the ground cools off by

On Earth the movement of air by winds and currents is due to

Light from Polaris, the North Star, tarvels to Earth by

Which action would help an air-conditioner use less energy on a hot, summer day?

Conduction is

Convection is

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