With the Continental Drift theory.
Answer:
Which statement describes clean air as a natural resource?
Clean air reduces the risk of illnesses and other health problems.
It depends on the latitude where you measure it.
It's about 69 miles on the equator, and it shrinks to zero at the poles.
In general, at any latitude,
Distance covered by 1 degree of longitude =
<em> (69 miles) x [ cosine(latitude where it's measured) ]</em>
The breaking down and changing of rocks at or near Earth's surface is called. Weathering.
