Answer:
Convection is the transfer of heat through hotter, less dense substance to rise and a cooler, more dense substance to sink.
1. Boiling water - the water on the bottom heats up and rises to the top of the pot and the cooler water takes its place and heats up.
2. Radiator - puts warm air out at the top and draws in cooler air at the bottom.
Step-by-step explanation: