the fact that due to density changes it sinks
Convection cells turn down because when the cells are away from the heat source the cells begin to cool. If cells are cooler they are more dense. Therefore, the change in density causes the cells to sink.
Too much heat causes the cell to turn down.
ice cream
The force that causes a convection cell to turn is the Coriolis force, which is a result of the rotation of the Earth. This force deflects moving air or water in the cell, leading to the rotation that defines a convection cell.
It is bumping into the lihosphere
coolness
coolness
ice cream
ice cream
coolness
The convection cell turns down at point c due to cooling of the air parcel at that elevation. As the air cools, it becomes denser and starts to sink. This sinking motion creates a downward convection flow in the cell.
The Coriolis force causes the convection cell to turn to the left at point A. This force is a result of the Earth's rotation and deflects moving air or water to the left in the Northern Hemisphere.