The crumpled paper was flat.
The crumpled paper had high ridges and low places like a mountain.
It represented rain.
It represented mountains.
Water flowed from low places up to high places.
Water flowed from high places down to low places.
The model was flat and water did not flow.
Water flowed up the mountain.
The crumpled paper represented the high and low places on land. The water represented rain on the mountain forming rivers.
