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Sound travels through liquid, solids or ...

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Example of man-made light sources

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When there is no light we are in the ...

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Never use .... appliances near water

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How many characteristics does the sound have?

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The pitch can be low and ...

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What material they don't allow the elctrical current?

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... can present a positive or negative load.

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Never put your fingers inside electric ..

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The duration can be short and ...

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Sources of light can be natural or ...

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What are the sounds that can cause damage to your ears?

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When light does not pass through a material, it is a material ...

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The intensity can be loud and ...

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Example of natural light sources

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Lemon slices are...

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Never ... electrical appliances with wet hands

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... pull out a plug by the cable

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Our bodies contain lots of ...

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Light is made from seven different colours ... up together

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... is created in power plants