Dip your toes in a sunny bay and the water can feel warm. Dive far below and it gets chilly fast. The ocean is stacked in temperature layers. The Sun warms the top. Deeper water stays cold for most of the year. That layering shapes where heat and nutrients move, and it helps drive ocean life and climate.
⚡ DID YOU KNOW?
Most of the ocean's volume is deep and cold. The warm surface is only a thin lid on a huge chilly world.