In this process, ring-like occur pushing the contents into the next part of the tube which is . this process is similar to squeezing toothpaste out of a tube.

it creates acid rain

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.