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100
They come from intestines of animals including humans
where do coliform bacteria come from
100
to keep out fish, garbage and other debris
What is the purpose of the large screen in a water treatment plant?
100
it is 60,00 km in length
how long is the mid-ocean ridge?
200
a good shower
How can you get rid of the parasite that causes "swimmers itch"?
200
It removes smaller fish, leafs and some algae
what is the purpose of the finer screen in a water treatment plant
200
an underground volcano
what is a sea mount?
300
water vapes reacts with airborne pollutants
What causes acid precipitation?
300
it is created when chemicals like alum are added
how is flock created
400
Get rid of the plutons
whet is the only way that we can reduce the amount of acid precipitation?
400
to kill microorganisms
why do we add chlorine to the water?