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100
The intestines of animals.
Where does coliform bacteria come from?
100
To keep out fish, big pieces of garbage and other debris
What is the purpose of large screens in the water treatment plant?
100
60 000 km
How long is the mid-ocean ridge?
100
Smaller rivers and streams.
What are tributaries?
100
Masses of ice and snow built up over thousands of years
What are glaciers?
200
Health Problems
What are the effects of swallowing water with too many coliform bacteria in it?
200
a chemical to keep floating particals clumped together
What is "floc"? and how is it created?
200
An underwater volcano
What is a seamount?
200
Rivers and curve in different ways.
What are meanders?
200
2700 m thick
How thick is Greenland's continental glacier at its thickest point?
300
When water vapor reacts with air borne pollutants.
What causes acid precipitation?
300
To kill microorganisms
Why do we add chlorine to the water?
300
The Challenger is 11 km below the surface of the ocean.
What is the worlds deepest point? How deep is it?
300
Gently sloping land on both sides of the river.
What is a flood plain?
300
A big part of the glacier that breaks off into the ocean.
What is an iceberg?
400
sulphuric acid and nitric acid
What are the 2 types of acid created in acid precipitation?
400
To a river or lake.
Where does the water from storm sewers go?
400
Precipitation, ground water and inlets.
What are 3 ways that water can enter a lake?
400
An area surrounded by high land.
What is a watershed?
400
18 000 tears ago
When did the glaciers covering North America begin to melt?
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