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Clear to let light pass through in straight lines

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Something that does not let thermal energy go through it easily

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Almost transparent to let different light pass through

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Not clear, not letting any light pass through

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The process of one thing becoming part of another

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The bending of light as it passes from one transparent medium to another, like air to water.

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The transfer of radiation by waves

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The transfer of thermal energy between two objects that touch each other.

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The transfer of thermal energy by waves

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The transfer of thermal energy by the movement of a gas or a liquid