∆ 9. When are hit by waves over thousands of years, a beach of sand is formed.__ ∆ 10. Sand, and waves hit rocks and smooth out the surface of older rocks.__

∆ 11. can hold back soil from eroding and also break rocks apart – causing erosion.__

∆ 12. Water flows into cracks of rocks and shrinks / expands when it freezes causing the rock to crack. (pick one)__

∆ 13. As water flows over rocks, it dissolves minerals causing different to sometimes appear.__

∆ 14. Pounding water, wind, and rain are major causes of erosion.__

∆ 15. Chemicals in the air / plants contribute to erosion. (pick one)

Air

Explanation:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.