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Surface Water

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Andrew Mildebrandt

on 30 August 2018

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Transcript of Surface Water

Streams and smaller rivers that feed into a main river are called tributaries.

The land area that supplies water to a river system is called a watershed.
Continental Divide
One watershed is separated from another by a ridge of land called a divide.

The Continental Divide, the longest divide in North America, follows the line of the Rocky Mountains.
Ponds and Lakes
Ponds and lakes form when water collects in hollows and low-lying areas of land.
Types of Lakes
Volcanic Lake = water fills the craters of old volcanoes.

Glacier-made Lake = Natural lakes formed in depressions created by ice sheets.

Reservoir = Human made lake created by damming a river to store water.
How Lakes Can Change
Seasonal Changes - Nutrients can be refreshed through the temperature changes in a seasonal lake.

Eutrophication = a build-up of nutrients in the water that causes algae to grow too thickly and block out sunlight.
Death of a Body of Fresh Water
The thick algae layer blocks out the sunlight, so the plants can no longer carry out photosynthesis, so they die. They no longer produce oxygen, so the fish die as well.
Water may leave a pond more rapidly than it enters.
Streams and rivers carry sediments into ponds or lakes. Over a long period of time, these sediments can fill up the body of water.
Surface Water
River Systems
Earth's Waters 1.3
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