Earths gravitational constant, known as g, as around 9.81 m s-1 .
The word around is a tip-off that it is a somewhat inconstant constant. It varies slightly depending on your latitude, longitude, height a.s.l. and the type and extent of the minerals under your feet. This last explains why some geologists carry a handy instrument called a gravimeter.
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Because the Earths' mass demands it be so.
That it is exactly 32f/sec^2 not sure. That it is constant depends on the Earths' mass which is fairly constant.
they form above earths surface (THIS ANSWER IS NOT CORRECT) They Form BELOW earths surface(:
no
It is the Earths Mass