1. In what century did the Industrial Revolution start?

1.  XV 2.  XVI 3.  XII 4.  XVIII 5.  XX

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2. When was the world wide web introduced to average users?

1.  1950 2.  1985 3.  1994 4.  1776 5.  2005

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3. When was the first cast-iron bridge built?

1.  1750 2.  1779 3.  1995 4.  1820 5.  1945

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4. What is the most common element in the Earth's atmosphere?

1.  Nitrogen 2.  Oxygen 3.  Carbon dioxide 4.  Nitrogen oxode 5.  Ozone

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5. What is the process responsible for the presence of oxygen in the atmosphere?

1.  nitrification 2.  denitrification 3.  photosynthesis 4.  ammonification 5.  respiration

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6. What value approximates the annual rate of increase of CO2 in the atmosphere?

1.  1 ppm 2.  100 ppm 3.  0.01 ppm 4.  10 ppm 5.  0.1 ppm

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7. What is the process directly responsible for sediment in the surface waters?

1.  tectonism 2.  salinity 3.  vulcanism 4.  subsidence 5.  erosion

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8. What is the average period of surface-water recycling?

1.  6 days 2.  12 days 3.  365 days 4.  180 days 5.  10 years

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9. What is the current concentration of CO2 in the atmosphere?

1.  215 ppm 2.  199 ppm 3.  480 ppm 4.  386 ppm 5.  255 ppm

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10. When did societies start to use the concept of "sustainable development"?

1.  1945 2.  1987 3.  2005 4.  1962 5.  1915

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