Which of the following is an example of convection?
a. hot air rising and cooler air falling
b. a hot object transferring heat to a cooler one
c. a hot oven warming the air around it
d. the rays of the sun warming the earth

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.