What percent of the world's total species could be extinct by 2050?
A) 25% B) 50% C) 35% D) 95% E) 5%
B) 50%
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The East African Community is an attempt at regional cooperation linking which of the following countries into one economic trading unit?
A. Uganda, Kenya, Tanzania. B. Kenya, Somalia, Ethiopia. C. Rwanda, Uganda, Malawi. D. Mozambique, Zimbabwe, Kenya.
Why is diorite considered a coarse-grained intermediate rock?
A) It contains a medium amount of silica. B) It contains a lot of silica. C) It contains very little silica. D) It is made up of the elements in the middle of the periodic table.
Chlorinated hydrocarbon pesticides, like DDT, are synthetic versions of
A) heavy metals. B) non-biodegradable, persistent molecules. C) ions and salts. D) vitamins and minerals.
Renewable primary energy sources include all the following except ________
A) natural gas B) biomass C) ocean tides D) sunlight E) wind