6.7b

Question 1

What is ocean acidification

Answer 1

a decrease in the alkalinity or pH of oceans, caused by the uptake of CO2 from the atmosphere released by burning fossil fuels

Question 2

how are oceans a carbon sink?

Answer 2

it absorbs more carbon from the atmosphere than it releases

Question 3

in the 1800s the avg ocean pH was 8.2 and in 2015..

Answer 3

was 8.1

Question 4

where does it decrease mainly

Answer 4

drop increases with the distance of the equator

Question 5

at what pH do coral reefs stop growing

Answer 5

7.8>

Question 6

Coral structure

Answer 6

soft bodied and feed on phytoplankton, protected by limestone, attached to rocks on sea floor and algae inside gives them good colour. acidification makes the shells thinner.

Question 7

sea has __ storage than land so absorbs __ of greenhouse gas

Answer 7

50x, 30%

Question 8

carbon acid reacts with carbon ions leaving more…

Answer 8

bicarbonate ions

Question 9

___ acidic water dissolves carbon shells

Answer 9

more

Question 10

can it be natural?

Answer 10

in the deep oceans there is less photosynthesis so CO2 builds up and produced near volcanic vents

Question 11

what else can destroy reefs

Answer 11

ocean temperature rise, change in currents circulation, land use change, sewage, ENSO, overfishing, dynamite fishing

Question 12

how much of mine biodiversity do coral reefs hold

Answer 12

25%

Question 13

positive feedback loop 1

Answer 13

Decrease in dimethyl sulphide produced by phytoplankton - less sulphur compounds in the atmosphere,
less cloud condensation nuclei,
less cloud cover,
less sunlight reflection,
warmer earth

Question 14

positive feedback loop 2

Answer 14

More acidic ocean,
more carbon in atmosphere,
deeper sea water gets disturbed,
the carbon there rises,
warms the ocean
makes the water more acidic