Chapter 2
How the Environment Works

Find the correct answer for each question.

1. What size is the Earth? The radius is:

   1.   ?    15,000 km
   2.   ?    6,500 km
   3.   ?    3,800 km

2. What means albedo?

   1.   ?    Earth surface reflection
   2.   ?    Earth surface adsorption
   3.   ?    Earth surface

3. What is the difference of Ozone and oxygen?

   1.   ?    Ozone has 4 atoms per molecule while oxygen has 3
   2.   ?    Ozone has 3 atoms per molecule while oxygen has 2
   3.   ?    Ozone has 1 atom per molecule while oxygen has 2

4. How thick is the athmosphere?

   1.   ?    50 km
   2.   ?    120 km
   3.   ?    1600 km

5. How much water is present in living organisms on average?

   1.   ?    10 %
   2.   ?    75 %
   3.   ?    58 %

6. How much of the surface of the Earth is land?

   1.   ?    30 %
   2.   ?    45 %
   3.   ?    62 %

7. What is precipitation?

   1.   ?    Radiation from the sun
   2.   ?    Heat flux
   3.   ?    Rain and snow

8. Which gas make up most of the athmosphere?

   1.   ?    Ozone
   2.   ?    Nitrogen
   3.   ?    Carbon dioxide

9. How much of the water on earth is salty?

   1.   ?    45 %
   2.   ?    97 %
   3.   ?    76 %

10. From where does the wind most often blow in the Baltic region?

    1.   ?    From the east
    2.   ?    From the south
    3.   ?    From the west

11. What is the name of our geological time period?

    1.   ?    The quarternary period
    2.   ?    The Jura period
    3.   ?    The glaciolimnic period