500
Your class wants to investigate how erosion effects mountains. So, you decide to build a mound of sand and observe what happens when you pour cups of water on to it. Explain how this model helps investigate the natural world and why you did it.
The mountain is modeled by the pile of sand and the river is modeled by the cup of water you pour over it. Since we cant take a trip to a real mountain to observe what happens, the class used a model to investigate how erosion effects mountains.