Carbon dioxide concentrations in the Northern hemisphere fall from spring through autumn as carbon is taken up in growing plants, and rise through the winter as organic matter decays
Indicate whether the statement is true or false.
Answer: TRUE
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An entrepreneur wishes to make a profit by purchasing gold by weight at one altitude and selling it at the same price per newton at another altitude. The entrepreneur should
A. buy at a high altitude and sell at a low altitude. B. buy at a low altitude and sell at a high altitude. C. disregard altitude because it makes no difference. D. none of the above
All map projections introduce at least some distortion because
A) it is impossible to represent a three-dimensional surface on a two-dimensional plane perfectly. B) the best mathematical algorithms used in map projections have not been discovered yet. C) the Earth is not a perfect sphere. D) the Earth's orbit around the Sun is not perfectly circular.
Groups of organisms that may have been separated for millions of years may be brought together in new combinations primarily by
A) shifting weather patterns. B) changes in ocean currents. C) plate tectonics. D) changes in Earth's magnetic fields.
Why are floods so common along the Red River of the North (in North Dakota, South Dakota, and Minnesota)?
A. The Red River Valley is geologically young (about 9,000 years old) and has not carved a deep valley. B. River flow increases as winter snow melts and meltwater runs northward into still frozen parts of the river. C. The gradient or slope of the riverbed is very low. D. All of these choices are correct.