🧱 Builder Science

A cement mixer drum keeps spinning all the way to the site. Wet concrete slowly hardens into solid rock.

If the drum stopped, the concrete could set hard inside! Spinning keeps it soft and mixed until it's poured.

Tall buildings dig deep down first, to strong solid ground or rock. That base is the foundation.

A tall tower on soft sand would sink or lean. Deep foundations hold it steady, like strong roots of a tree.