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How are convection cells set up?

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What sets convection currents into motion?

If you are heating water in a pan on the stove, the water at the  bottom of the pan will warm first. Since warm water is lighter, it  will rise, and cool water from the top

What causes convection cell to turn up at point a?

remember this is a question u really need to think about. ANSWER: the force of it bumping into the lithospere resources: my brain the picture on the worksheet, and etc the ans