What is the name for the elevation difference in between two adjacent contour lines

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

Name the peninsula that separates the bering sea from the sea of okhotsk?

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves.b. when a river overflows it moves downhill resulting in the formation of caves.c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves.d. when water empties into lakes, sediment is deposited, resulting in formation of caves.