It's a lot easier and less labor-intensive to dig a dwelling or expand a cave that will keep you warm in winter and cool in summer than a to build an above-grou

It's a lot easier and less labor-intensive to dig a dwelling or expand a cave that will keep you warm in winter and cool in summer than a to build an above-ground house that will. Rodents which would invade below-ground food stores weren't as widely spread in ancient times either.