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Weathering is the process of breaking down of rocks, soil, minerals, etc. The materials are broken down by contact of the atmosphere, running water, and organisms. The process wears the materials down to several smaller pieces. There are chemical and mechanical processes. An example would be in a river or stream, where the weathering by water lifts up rocks and moves them to the bottom of the stream, or when water freezes in rock crevices and creates ice wedges.

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Erosion is another process of changing the surface of our planet. When rivers and streams flow, they erode rock, soil, and sediment (small grains of broken-down rock). Erosion is when the sediments are moved from one place to another. As the process occurs over time, erosion will cause streams to widen and deepen areas. An example is canyons, in which the formation is caused by water moving rock away to form the canyon.

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As streams erode, they will start to drop their load at the bottom of the stream. The name for this is deposition, which is the process of dropping eroded material. It occurs when the pull of gravity is greater than the push of water or wind. Examples are when layers of sediment form at the bottom of an ocean, or when waves drop sand on a beach.