What are the major processes that can remove CO2 form the atmosphere? What are the approximate time scales for these processes to be effective?
What will be an ideal response?
The major loss processes for atmospheric CO2 are (with their effective timescales in parentheses): reforestation (10's – 100's of years), fertilization of forests (10's – 100's of years), dissolution of CO2 in the oceans (10's – 1000's of years), dissolution of deep-sea carbonates (100s – 1000s of years), and the weathering of continental rocks (104 – 105 years).
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Analyze the timeline shown. Which letter most likely represents when hominids (early humans) evolved?
Blight fungus kills U.S. chestnut trees because the trees ________
A) release the fungus in the leaves that fall to the ground and the fungus is absorbed in the soil B) release the fungus into the soil and it is drawn up in the roots C) are hosts to the vectors of the fungus D) have not matured long enough to survive E) have not coevolved with the fungus
Which continent likely represents the largest absolute land area experiencing degradation?
a. Europe b. North America c. Asia d. South America e. Africa
Which of the following are stateless nations?
A. Roma (Gypsies) B. Palestinians C. Kurds D. Basques E. all of these