Materials: A milk carton (quart size), fine, dry soil, plastic tub, watering can with a diffuser top, empty mayonnaise jar, ruler, funnel with a wide hole In the film: The Grand Canyon of Yellowstone is a spectacular geologic example of how a river can erode the earth to expose colorful rocks and minerals.
(a river; can erode; the earth; to expose colorful rocks and minerals)
a river
can erode
the earth to expose colorful rocks and minerals