HELP

Question / Answer / Mark
1 / a / A – 2; B – 4; C – 1; D – 3. / 3
3 or 4 correct = 3 marks; 2 correct = 2 marks; 1 correct = 1 mark
b / i / Carbon dioxide / 1
ii / The greenhouse effect. / 1
iii / More fossil fuels being burned/more cars using petrol/forests are
being cut down/populations are increasing. / 1
Accept one sensible suggestion.
iv / Any two from:
Air temperature rises/Polar ice caps melt/Sea levels rise/Flooding
around the coasts/Unpredictable weather/More rain/More drought/etc. / 2
Accept other sensible suggestions.
Total for Help 8

CORE

Question / Answer / Mark
2 / a / i / The difference between energy gain and loss keeps the energy level the same; / 1
so the temperature stays the same. / 1
ii / It will rise. / 1
iii / It will rise. / 1
b / The Sun is in a steady state/gives a constant supply of energy. / 1
Accept other equivalent responses
c / Burning fossil fuels produces carbon dioxide. / 1
Increasing carbon dioxide reduces the energy lost into space / 1
so the energy remaining increases, raising the temperature. / 1
d / Cars generate carbon dioxide, which increases global warming / 1
and flooding is a possible consequence of global warming. / 1
Total for Core 10

EXTENSION

Question / Answer / Mark
3 / a / UK – 570 million tonnes; USA – 5460 million tonnes;
India – 1100 million tonnes. / 3
b / Two from:
The USA is much more technologically advanced.
Americans expect a higher standard of living, which uses more energy.
There are more cars in the USA. / 2
Accept equivalent responses.
c / From the cities/from industrial sites. / 1
d / It/land/employment is much cheaper/pollution regulations are less strict. / 1
e / It will rise. / 1
Total for Extension 8

© Harcourt Education Ltd 2004 Catalyst 3

This worksheet may have been altered from the original on the CD-ROM.