3b

Question 1

what is happening to the worlds population? what is largely responsible for this trend?

Answer 1

rising very quickly, not slowing down due to modern medicine and farming

Question 2

suggest three ways in which a rising population is affecting the environment

Answer 2

puts pressure on the environment, taking more resources from the environment, one day we are going to run out of raw materials.

Question 3

what are the four main activities that use up land?

Answer 3

1) buildings
2) farming
3) dumping waste
4) quarrying

Question 4

name five important stores of carbon

Answer 4

oceans
lakes
ponds
peat bogs
green plants

Question 5

why is it so important to have stores of carbon?

Answer 5

because it means CO2 is removed from the atmospere

Question 6

name two important greenhouse gases. why are they called greenhouse gases?

Answer 6

methane and carbon dioxide, because the levels of these two gases are rising sharply

Question 7

give three reasons why people chop down large areas of forest

Answer 7

1) provides timber
2) clear land for farming
3) to produce paper

Question 8

what is biodiversity? describe how deforestation can lead to a reduction

Answer 8

variety of different species in a habitat,

…

Question 9

explain why using peat-free compost is better for the environment than using peat.

Answer 9

to reduce the demand for peat

Question 10

describe three possible consequences of global warming

Answer 10

sea levels rise
ice caps melt
change to weather patterns

Question 11

does fermentation involve aerobic or anaerobic respiration

Answer 11

anaerobic

Question 12

what are the two main components of biogas

Answer 12

70% methane and 30% carbon dioxide