Most of our winds are caused by convection currents occurring on a big scale in air. Many ocean currents are also due to convection currents.

Convection explains why hot air balloons rise, and also why it is often hotter in the lofts of houses than downstairs. Convection is also seen on a much bigger scale in our weather and ocean currents.

This broad, 8,000-mile-long bulge in the crust of the earth differs in many ways from the rest of the ocean bottom. It may be the result of huge convection currents in the interior By Henry W. Menard ...