Once heat from the sun penetrates the earth's atmosphere, the heat is circulated as warm air rises and cold air sinks. what is this process called?
1. convection
2. radiation
3. reflection
4. conduction

Once heat from the sun penetrate the Earths atmosphere, the heat is circulated as warm air rises and cold air sinks,this process is called convection Convection can be demonstrated by placing a heat source {cooker} at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer fluid moving into cooler areas

Outermost (valence) electrons