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Clouds & Particles

Basics

2. Particles

Worksheet 1

Can you answer the following questions?

1) Aerosols are ...

a) small particles in the atmosphere.
b) small particles in seawater.
c) gases in seawater.
d) gases in the atmosphere.

2) Aerosols come from ...

a) only human activities.
b) both human activities and natural processes.
c) only natural processes.
d) They have always been there and are not formed or destroyed.

3) Which of the following is not a very important source of aerosols?

a) oceans
b) soils
c) volcanoes
d) outer space

4) The main source of anthropogenic aerosols is ...

a) severe storms.
b) deserts.
c) all living organisms.
d) humans.

5) One of the following sources of anthropogenic aerosols is not very important. Which is it?

a) industry
b) residential heating
c) household dirt
d) vehicles

6) The aerosol concentrations in the air are highest ...

a) above the sea.
b) above urban areas .
c) above rural areas.
d) The air is well mixed, so aerosol concentrations are approximately the same everywhere.

7) The concentration of ...

a) aerosols doesn't depend on their size.
b) fine aerosols is approximately the same as the concentration of coarse aerosols.
c) coarse aerosols is higher than the concentration of fine aerosols.
d) fine aerosols is higher than the concentration of coarse aerosols.

8) Which of these is not an aerosol transformation process?

a) radiation
b) coagulation
c) condensation
d) cloud processing

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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.