There are two questions. Put your answers as two letters such as A and A or C and A if you don't know the answer to both just let me know which one you do know the answer to. Thank you.
Which best describes convection?

A It relies on the collision of particles within or between substances.
B It occurs in solids, liquids, or gases that are heated.
C It results when portions of a liquid cool and rise.
D It is driven by temperature differences within a fluid.
And...

A thermogram of a house shows high amounts of thermal energy around the windows but not around the roof. Which conclusion is best supported by the thermogram?

The windows take in a lot of solar radiation.
The roof takes in a lot of solar radiation.
The windows are not energy efficient, but the roof is.
The roof is not energy efficient, but the windows are.