Describe wind or water as a cause of slow change to the surface of the Earth and give a real example, such as smooth river rocks or sand dunes.
Not every change to the surface of the Earth happens fast. Some changes take a very long time, even thousands or millions of years. A river slowly wears away rock, grain by grain, which is how a deep canyon can form over an enormous amount of time. Wind can slowly pile sand into tall dunes, one grain at a time.
You can see evidence of slow change without waiting millions of years yourself. A smooth, rounded rock found in a river has likely been tumbled and worn down by moving water for a very long time, while a rock freshly broken off a cliff still has sharp, jagged edges.
Mastery looks like: They describe wind or water as a cause of slow change to the surface of the Earth and give a real example, such as smooth rocks, dunes, or canyons.
Common stumbles: Assuming all Earth changes happen quickly after learning about earthquakes and volcanoes; not connecting a rock's smoothness to the slow process of water tumbling it over time.