Downward movement under the force of gravity only.
Oh but they are !
Newton's 3rd law of motion says that for every action, the <em><u>re</u></em>action is
equal and opposite. That's as balanced as you can get.
D.to bring light together
There are plates under the surface that shift when there is interruption on the surface <span />
I will say increasing temperature but you dont have that option on your list, so I would take B. Increasing Concentration.
