Put the jar and the bag in a freezer overnight. When you remove the jar, it will be broken. Handle and dispose of the broken glass carefully. Ask students to predict what this demonstration might tell us about rocks and weather. Erosion - When particles weathered from rocks are carried away, it is called erosion.
Erosion is responsible for wearing down exposed places and depositing sediment in level places.
Observe the mountain once a week for three months. Have students measure its height and width and note any changes in its surface. After observing the mountain for an extended period of time, ask students to suggest what forces might have caused changes in your mountain. Punch holes in the bottom of a plastic cup to make a sprinkler. Place three to five centimeters of soil in each of two planting flats.