Definition: the breaking down of rocks. There are 2 kinds: chemical weathering and physical (mechanical) weathering.
Causes: plants, animals, atmosphere (wind, oxygen in the air causing chemical weathering), water.
- Plant roots grow through rocks and break them down into soil.
Definition: the movement of weathered materials.
Causes: water (rain, river, waves, etc.), wind, glacier (the ice is moving slowly), gravity (pulling rocks down), human and animal activities.
- A river carries the pieces of broken rock down stream.
- Rain splashes dirt from a garden onto the sidewalk
Definition: the collection of eroded materials.
Causes: (same as erosion)
- A river deposits a mound of sand near the bottom a hill.
- The waves deposit sand on a beach.