In the diagram below, light from the Sun strikes a beach (Z). The beach sand gains heat then warms the air that is immediately above it (X) and the sand that is immediately below it (Y). The warm air rises and is replaced by cool air (W). At point X, only the air that is in direct contact with the sand is heated. And at point Y, only subsurface sand that is in direct contact with the hot surface sand can gain heat. This means that mostly _______ is occurring at points X and Y.

radiation

conduction

convection

advection

1 answer

The process that is mostly occurring at points X and Y is conduction.