Earths Resources Water

Question 1

Pure water

Answer 1

Just H20 molecules in it

Question 2

Potable water

Answer 2

Water that is safe to drink
Still contains some minerals
Must not contain any microbes

Question 3

Sterilise

Answer 3

Kill microbes
Use chlorine (Cl2) , ozone (O3) and UV light

Question 4

Sources of potable water
Ground / surface

Answer 4

Process to make potable - filtration / screening to remove mud and grit
Sterilising with chlorine or uv light to kill microbes

+ simple to purify in few steps
- limited supply

Question 5

Sources of potable water
Sea

Answer 5

1)Remove salt ( desalination )
By reverse osmosis
Or Distillation
2)Sterilisation
+ loads of it
- lots of energy needed to purify
Expensive

Question 6

Sources of potable water
Waste

Answer 6

1) screening
2) sedimentation
3) aerobic digestion
4) anaerobic digestion

+ loads of it
- lots of steps to purify