Desertification is ________
A) a natural process of succession that cycles from deserts to prairies to forests to deserts
B) the formation of dryland ecosystems in regions where temperatures have increased
C) often the result of overgrazing and drought
D) the natural movement of deserts advancing into new regions due to shifts in wind direction
C
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Climatic models predict that the concentration of a certain gas must increase in the atmosphere for CO2 to produce a global warming of between 2°C and 5°C. According to this prediction, which of the following gases must increase?
A. chlorofluorocarbons (CFCs) B. water vapour (H2O) C. sulfur dioxide (SO2) D. ozone (O3)
You will not be able to see a rainbow if the Sun is greater than ________° above the horizon
Fill in the blank(s) with correct word
Which statement comparing terrestrial and Jovian planets in our solar system is most accurate?
A. Jovian planets are smaller and less than terrestrial planets. B. Jovian planets are smaller and more dense than terrestrial planets. C. Jovian planets are larger and less dense than terrestrial planets. D. Jovian planets are larger and more dense than terrestrial planets.
Antarctica does not lie above any hot spots.
Answer the following statement true (T) or false (F)