a) growth of nitrogen-fixing crops b) burning of fossil fuels c) use of nitrogen fertilizers d) burning of wood products e) mining of guano deposits 20) Red tides (a toxic algae bloom in the ocean) are primarly associated with: a) high levels of nitrogen in the water b) high levels of phosphates c) increased reactions between carbon dioxide and seawater d) industrial pollution 21) Nitrogen saturation is thought to be responsible for a) forest death b) increased production in crops such as corn c) photochemical pollution d) greenhouse warming 22) Ocean productivity is associated with upwelling a process that: a) brings warm water to the surface b) pushes water away from the coastlines c) brings nutrient rich water to the surface as a result of wind action d) counters the effects of downwelling 23) In addition to respiration, carbon dioxide is returned directly to the atmosphere during the process of: a) burning of organic materials b) tectonic uplift c) deposition of guano on Caribbean islands d) As inorganic minerals break down into elements of carbon and dioxide 24) Phosphorus, an important nutrient, enters living plants from: a) groundwater b) surface water c) soil d) air e) solar radiation 25) The nitrogen cycle, one of the most important biochemical cycles, may cause environmental problems because too much nitrogen can: a) result in acid rain b) deplete the ozone shield c) contribute to the greenhouse effect d) reduce earthshine e) cause eutrophication in bodies of water 26) Carbon is called the 'backbone' of our living environment because carbon: a) is used in the process of respiration to produce carbohydrates and oxygen b) is produced by organisms c) dioxide prevents the Earth from cooling down d) is a medium for the transfer of material or energy from one reservoir to another e) is the chemical building-block of the organic world 27) Since the extensive fires in Yellowstone National Park in 1988, the park often has been cited as an example of the connection between forest fire and natural succession.
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