Gap-fill exercise
Look at the graphs and complete the commentary by filling in the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you do!
Any assessment of the likely consequences of human production of aerosols must bear in mind that natural production of aerosol materials is of a very much higher order. This is clear in
7.1 which shows the
of
of
for
. None the less the data suggest that on a
scale
activity is now producing
million
per year of small
into the atmosphere, compared to a
rate of
million tonnes per year, or a
of about 4.5:1.
(From: Andrew Goudie,
The human impact on the natural environment
. Basil Blackwell, 1981)
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Hint
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