Which of the following countries has passed a law that states all chemicals that are persistent and can accumulate in living tissue will be banned by the year 2020?
a. the United States
b. France
c. China
d. Norway
e. Sweden
E
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Polar regions receive
A) minimum variation in solar isolation and high Sun angles. B) maximum variation in solar isolation and high Sun angles. C) minimal variation in solar isolation and low Sun angles. D) maximum variation in solar isolation and low Sun angles.
Two competing theories have been advanced to explain the origin and diffusion of languages. These are
A) The Babylonian Thesis and the Russian Thesis B) The War Thesis and the Peace Thesis C) Mayan Thesis and Inca Thesis D) The London Thesis and the Washington Thesis E) The Eastern Thesis and the Western Thesis
The two main categories of mitigation options for limiting climate change are controlling the CO2 content of the atmosphere and ________.
A. managing the solar radiation received by Earth B. changing Earth's orbital parameters C. controlling the motion of tectonic plates D. limiting the energy output of the Sun E. reducing our dependence on nuclear energy
Why does dense deep water up well in oceans?
A. It is affected by surface currents and continents. B. It is more dense than surrounding water. C. It is less dense than surrounding water.