GEOLOGY

Detailed explanation-1: -These hot water molecules residing near the heat source tend to become less dense. They rise above cooler dense molecules. As these hotter molecules rise, they tend to cool down and begin to sink, replacing cooler molecules.

Detailed explanation-2: -How does convection work? Convection works by areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.

Detailed explanation-3: -When part of a liquid or gas is heated, it expands and becomes less dense. The warmer, less dense liquid rises upwards, and the cooler liquid falls to take its place. This cycle of a liquid or gas rising and falling is called a convection current.