25. why would you not cork (stopper) a chemical in a test tube that you are
heating?

the gasses in the tube will either make the tube explode or the cork pop off and could possibly hit something.

blow

Explanation:

it could blow up because of the chemical that is in the tube can let off carbon that can build up that can blow the stopper off of the testing tube

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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