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River System
Pond and Lakes Form and Change
Water Underground
100
What is a River System?
Groups of streams, lakes, and rivers that form together.
100
How do Ponds and Lakes Form?
When water collects in hollow and low-lying areas of land.
100
How does water move underground?
It trickles down between particles of soil and through cracks and spaces in layers of rock.
200
What is a Tributary?
A stream or small river that feeds into a larger river.
200
How do Ponds and Lakes change?
When extra water comes flows into them.
200
What are unsaturated zones?
Top layer of the water zones that contain air and water.
300
What is a Water Shed?
The land area that supplies water to a river system.
300
What causes lakes to "disappear"?
Natural processes and human activities.
300
What are saturated zones?
The middle layer where there is ground that is saturated with water.
400
How do River Systems connect?
The rivers and streams and lakes connect together by eroding land that allows them to come together.
400
What is Eutrophication?
A process when nutrients build up in a lake over time.
400
What is a Aquifer?
Any underground layer of permeable rock or sediment that holds water and allows it to flow.