Me asap heat flows .
hot to cold
cold to hot
hot to hot
cold to cold

Heat flows from the hot to cold substance.

Option A

Explanation:

The medium or substance which has the higher temperature referred to as the hot substance transmits heat to the less temperature body or substance referred to as the cold substance. The temperature difference makes the heat flow from warmer substance to cooler substance.

The temperature thus flows through the gradient from high to low. This transmission takes place until both the substance in contact becomes equal in temperature.

gravity

explanation:

the part of the wave he is travelling on is the crest