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Place a transparent coffee pot filled with water on a hot plate. When it starts to heat, place a few drops of food coloring in the water. Observe the flow patterns.

Next, move the pot so that only one side of it is on the heating unit, and add a few more drops of coloring. You will see a definite current in the water.

What you are seeing illustrates how vertical currents move in the ocean. Vertical currents move from ocean depths to the surface and north and south from the equatorial region (hot) toward the poles (cold).

Why does this movement take place? (Heated water is less dense and is lighter than cooler water, so it rises and is replaced by cooler water.)

What heats it at the ocean floor anyway?

What is the coriolis force?

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