A region of the earth is in isostatic equilibrium when A. the tectonic plates aren't present in the subduction zone.
B. the lithosphere and asthenosphere stop competing with one another for plate movement.
C. granitic and basaltic rock have different densities that promote movement.
D. the floating force from the asthenosphere is balanced with gravity.

ammonium chloride & tallow

gravity

explanation:

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

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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