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.

The primarily goals of the zapatistas of mexico in 1994 were land reform and redistribution. it is also included in their demands to have a greater political and cultural autonomy for the indigenous people of chiapas and the rest of mexico.