the breakdown of rock material by physical and chemical processes.
weathering
the process by which rock is broken down into smaller pieces by physical changes.
Physicalweathering
the breaking down and wearing away of rock material by the mechanical action of other rock
abrasion
the breakdown of rocks by chemical reaction.
chemicalweathering
the processes by which other chemicals combine with oxygen.
oxidation
when fossil fuels are burned, other chemicals combine with water in the atmosphere to produce even stronger acids. When these stronger acids fall to earth ,they are called acid precipitation. 
acidprecipitation
the processes by which sediment and other matierals are moved from one place to another.
erosion
the processes by which eroded material is dropped
depostiotion
many layers of deposited sediment can form a flat area.
floodplain
streams often deposit their loads in a fan-shaped pattern called a delta.
delta
a fan-shaped deposit that forms on dry land.
alluvialfan
the water located within the rocks below earths surface.
groundwater
a place where land and a body of water meet.
shoreline
a shoreline tat is made up of material deposited by waves and current.
beach
and underwater or exposed ridge of sand ,gravel, or shell material.
sandbar
a long, narrow island, usually made of sand that forms parallel to the shoreline a short distance offshore.
barrierisland
mounds of wind-deposited sand.
dunes
thick deposited of this windblown, fine-grained sediment
loess
a large mass of moving ice that forms by the the compacting of snow by natural forces.
glacier
the general term for all materials carried and deposited by a glacier.
glacial drifts