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Clouds & Particles

Basics

2. Particles

Worksheet 2

Can you answer these questions?

1) The mechanism by which aerosols are removed from the atmosphere is called...

a) vaporisation
b) deposition
c) decomposition
d) convection

2) Aerosols are removed from the air when ...

a) animals and people breathe in.
b) they settle onto the surface of the Earth (the sea or the land).
c) they are absorbed by plants during photosynthesis.
d) they escape into outer space.

3) Which statement is correct?

a) Fine and coarse aerosols have approximately the same lifetimes.
b) It is not the size that decides the lifetime of the aerosol in the air.
c) Coarse aerosols have longer lifetimes than fine aerosols.
d) Fine aerosols have longer lifetimes than coarse aerosols.

4) The lifetime of aerosols emitted from volcanoes may be longer than for other aerosols because...

a) they have a higher temperature.
b) they contain sulphur.
c) they are injected into high levels of the atmosphere.
d) they are injected into low levels of the atmosphere.

5) Aerosols can be harmful to human health by causing ...

a) breathing problems.
b) skin-cancer.
c) hair loss.
d) obesity.

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About this page:

Authors: Ellen K. Henriksen and Camilla Schreiner - University of Oslo - Norway. Scientific reviewer: Justine Gourdeau - LaMP Clermont ferrand - France - 2004-01-13. Quiz programmer: Julia Heres - University of Nürnberg - Germany. Last update: 2004-03-27.