A group of friends gather around a fire to stay warm. This is an example of ________.

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

Near the ceiling of a room the air is warmer. The warm air rises because of ________.

The type of heat transfer that creates currents in water is called ________.

The heat transferred from the Sun to the Earth by waves is called ________.

A pot is placed directly on a stove. The pot gets hot due to ________.

A certian type of decorative lamp contains colored liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to ...