Weathering and Erosion

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Weathering
The chemical and physical processes that break down rock on Earth's surface.
Erosion
The process by which water, ice, wind or gravity moves weathered rock or soil.
Uniformitarianism
The geologic principle that the same geologic processes that operate today operated in the past to change Earth's surface.
Mechanical weathering
The type of weathering in which rock is physically broken into smaller pieces.
Abrasion
The grinding away of rock by other rock particles carried in water, ice or wind.
ice wedging
Process that splits rock when water seeps into cracks, then freezes and expands.
Chemical weathering
The process that breaks down rock through chemical changes.
oxidation
A chemical change in which a substance combines with oxygen, as when iron oxides, forming rust.
Permiable
Characteristic of a material that is full of tiny, connected air spaces that water can seep through.