what are the forces of weathering and erosion
The Forces of Weathering. Water is an important force that greatly effects weathering, but it is not the only force. Other forces include the atmosphere, and even plant and animal life. The atmosphere is comprised of many different types of gases. These gases are able to penetrate into the openings of rocks.
Once the rock has been weakened and broken up by weathering it is ready for erosion. Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. Mechanical weathering physically breaks up rock. One example is called frost action or frost shattering. Water gets into cracks and joints in bedrock.