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post test: waves
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select the correct answer from each drop-down menu.
pictures that we receive from space are of the past
because it takes time for
sound
to reach earth.
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the answer is to check all of them! they all apply well at least i think so!

this would be about 43%

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.