Because with the fire the paleolithic people cooked their food as well as hardened their armor and weaponry. <span />
Answer: They push against each other along a line called a front. When a warm air mass meets a cold air mass, the warm air rises since it is lighter. ... On the other hand, when a cold air mass catches up with a warm air mass, the cold air slides under the warm air and pushes it upward. As it rises, the warm air cools rapidly.
Explanation:
