Water, Carbon and Climate

Question 1

Positive feedback in a water cycle

Answer 1

1)Temperature rise
2)Evaporation increases
3)Amount of water vapour in atmosphere increases

Question 2

Negative feedback in a water cycle

Answer 2

1)Temperature rise
2)Evaporation increases
3)Amount of water vapour in atmosphere increases, causing more clouds to form
4)Increased cloud cover reflects more of Sun’s energy back into space
5)Temperatures fall

Question 3

Positive feedback in the carbon cycle

Answer 3

1)Temperature rise
2)Plant respiration rate increases
3)Amount of CO2 in atmosphere increases
4)Greenhouse effect increases

Question 4

Negative feedback in the carbon cycle

Answer 4

1)CO2 in the atmosphere increases
2)Extra CO2 causes plants to increase growth
3)Plants remove and store more CO2 from the atmosphere
4)Amount of CO2 in atmosphere reduces