In general atmospheric pressure is greatest near earths surface and as you move out toward space is

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Your question: In general atmospheric pressure is greatest near earths surface and as you move out toward space is .

Your In general atmospheric pressure is greatest near earths surface and as you move out toward space  the atmospheric pressure decreases.

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Which one is the underlined word?

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser