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Light waves carry energy.

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Light travel in a straight path.

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Refraction is the bending of light.

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Sound travels faster in liquid than in solid.

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Sun is the main source of natural light and heat.

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Conduction is the transfer of heat through solid.

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Echolocation is used by whales and bats to locate food.

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Using earmuff can protect our ears from too much noise.

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Radiation is the transfer of heat through space or a vacuum.

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Convection is the transfer of heat by movement of matter in liquid and gas.

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Light can be reflected or refracted. Bending of light is called _________________, while bouncing of light is called ____________________.

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__________is a transfer of heat from molecules through solid materials

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_______________ is a transfer of heat through a current or movement of liquid,

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______________ is a transfer of heat through a vacuum or through space.

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Bats and dolphins use _______________ in locating and detecting food and other objects.