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Weathering and Erosion Outline Name_________________________________ Weathering is the process that breaks down rock and other substances on Earth’s surface. The force of weathering breaks rocks into smaller and smaller pieces. Erosion is the removal of these small particles of rock by wind , water ice or gravity. Weathering and erosion work together to continuously wear down and carry away the particles, constantly changing the surface of Earth. There are two main types of weathering: Mechanical [sometimes called physical] Chemical Both types of weathering act slowly, but over time, they break down even the biggest, hardest rocks. Mechanical weathering breaks rocks down into smaller pieces. The causes of mechanical weathering include: Freezing and thawing Release of pressure Plant growth Action of animals and abrasion Chemical weathering breaks rocks down rock through chemical changes . The causes of chemical weathering include: Water Oxygen Carbon dioxide Living Organisms Weathering and Erosion Outline Name_________________________________ Acid Rain Erosion is the process by which natural forces move weathered rock and soil from one place to another. Some of these forces include glaciers, wind, water, earthquakes, volcanoes, tornadoes, hurricanes, mud flows, and aAs soon as a rock particle (loosened by one of the two weathering processes) moves, we call it erosion . When it comes to rest , or lay down, we call it deposition. Weathering, erosion, and deposition act together in a cycle that wears down and build up Earth’s surface. valanches.