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Tropical climates with rainy summers and dry winters.

Epipelagic - 0-200m
Mesopelagic - 200-1000m
Bathypelagic - 1000-4000m
Abyssopelagic - 4000-Ocean Floor
Hadopelagic - Below Ocean Floor

A river forms 'V' shapes in the contour lines, pointing upstream.

Clouds of volcanic ash and debris blocks sunlight and makes the Earth cooler at the surface.

It's driven by differences in density due to different water temperatures and salinities in ocean water, forming a large global "conveyor belt." It goes to the equator because the density is higher at the poles and salinity is slightly lower at the equator than its surroundings.