What would explain the poor condition for biological productivity in the open tropical ocean??
A) ?Converging currents produce downwelling, thus carrying nutrients to the deep ocean.
B) ?Gyres contain pollution and decaying organisms that use up available nutrients.
C) ?Upwelling delivers seafloor sediment to the surface, thus blocking necessary sunlight for photosynthesis.
D) ?Strong layering isolates deep, nutrient-rich water from the sunlit ocean surface.
D
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Which of the following is a hazard but not a risk, according to the textbook?
A) The Kilauea volcano, which covers subdivisions with molten lava B) A cinder cone that erupts hot molten fragments on an unpopulated Pacific island C) A volcano in Iceland that threatens people with dangerous gases D) A volcano in Iceland that caused catastrophic flooding that destroyed houses and roads E) All of these are both a hazard and a risk.
Shantytowns in Brazil are called
A. ranchos B. colonias C. sertao D. favelas
Urban runoff is an example of a type of ________ ________ pollution
Fill in the blank(s) with correct word
Small island nations such as the Maldives are in the international spotlight because they ________
A) are the largest emissions producers in their respective areas B) opposed China's proposals for global carbon neutrality at the Copenhagen Conference in 2009 C) may be among the first nations to be completely flooded by rising sea levels D) have exceeded the emissions reductions set by the Kyoto Protocol E) are accepting climate change refugees from other nations