Water Cycle

Question 1

Water cycle

Answer 1

1) Precipitation
2) Perculation (water trickles to rivers through soil)
3) Some plants uptake seam water
4) Evaporation and transpiration
5) Water vapour rises and condenses into clouds

Question 2

Why does sewage pollution in the river decrease the oxygen levels?

Answer 2

Increased levels of aerobic bacteria which use oxygen from the water in respiration

Question 3

Clean water indicator species

Answer 3

-stonefly
-mayfly
-freshwater shrimp

Question 4

Polluted water indicator species

Answer 4

-sludge-worm
-bloodworm
-red tailed maggot