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Earth Science Chapter 11
Erosion is the removal and
transport of surface material, such as rock and soil. Erosion by water formed the Grand Canyon.
The water cycle is the
continuous movement of water from the air onto land into the ground and back to
Evaporation occurs when water
becomes vapor. The water comes back onto
land in the form of precipitation.
Precipitation is rain, snow, sleet, or hail that falls from falls from
Runoff is water that flows
across the land, from rivers and into the ocean. Water also seeps into the ground by
Tributaries are smaller streams
or rivers that flow into larger ones.
Streams follow a path called a
channel. When streams increase in
length, they become rivers.
Deposition is the process by
which material is dropped. Rock and soil
deposited downstream is called alluvium.
Most of the world’s caves
formed as ground water dissolved limestone.
Less than 1% of the Earth’s
water is used for drinking. 3% is
drinkable, but most of that is frozen.
It’s therefore important to
preserve our water. Sewage treatment
plants are factories that clean the waste materials out of water.
The average US household uses
about 100 gallons of water per day.
Industry uses even more.