Water will seep into a small crevice in a rock. At night, the water freezes and _________. During the day, water will melt. When this pattern keeps repeating, it will eventually crack the rock open. This is called ____________ weathering.
Water will seep into a small crevice in a rock. At night, the water freezes and EXPANDS. During the day, water will melt. When this pattern keeps repeating, it will eventually crack the rock open. This is called MECHANICAL weathering.
