Land and Water


Water has an important role in shaping the land on earth.
Soil is a composite of weathered materials and organic matter at the earth’s surface. Soil components include sand, silt, clay, gravel, and humus. Each soil component has unique properties.
The wearing away and moving of soil and rock is erosion; the settling of eroded materials is deposition.
The water cycle includes the processes of evaporation, condensation, and precipitation and the passage of water over and through land. These processes affect the shape of the land.
Both the flow of water and the slope of the land affect erosion and deposition.
Tributaries are branches of streams that converge to form the trunk of a larger stream, or river. Together, they act as a system that drains the land.