Help 10 points!! Describe the process of frost wedging.?

Question

Help 10 points!! Describe the process of frost wedging.?

Answer 1

This isn't really a Botany question, but:

"Frost wedging is a form of mechanical weathering (that is, weathering that involves physical, rather than chemical change). Frost wedging is caused by the repeated freeze-thaw cycle of water in extreme climates.

Most rocks have small cracks in them, called joints (or, tectonic joints). When it rains, rainwater seeps into these joints. As the day cools and temperatures at night drop below freezing, the water inside the joints freezes. As water freezes into ice, it expands. The expanding ice places pressure on the joints in the rock. Finally, when the pressure is too much, the joint expands. In some cases, the rock will split, though this usually happens after repeated freeze and thaws. As new water is added during the warmer days, more ice is created at night, wedging the joints apart further."

From: http://estes.on-line.com/rmnp/articles/f...