Answer:
In the upper reaches (also known as the source) the gradient is at its steepest because of vertical erosion. This changes further downstream as lateral erosion (side to side) from the river and deposition start to replace vertical erosion as the dominant process. Finally, the river really flattens out as it approaches the mouth as deposition become dominant.
Weather refers to long term atmospheric conditions, climate refers to short term
Answer: C
Explanation: Not only is the capital, Lima, located along the Pacific coast, but many other cities line the ocean as well. This, altogether, would insist that a majority of the population of Peru lives on the coast.