Natural causes of climate change include variation in
A) the concentration of atmospheric carbon dioxide.
B) Earth's density.
C) the amount of water in the hydrosphere.
D) the concentration of atmospheric nitrogen.
A
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Which of the following diseases have been eliminated by the use of vaccines?
A) HIV B) heptatitis C C) tuberculosis D) malaria E) None of these have been eliminated, all of these are still active areas of research.
Based on your knowledge of the pressure gradient and Coriolis Effect, identify the proper pressure cell and location.
A. high pressure, Southern Hemisphere B. low pressure, Northern Hemisphere C. low pressure, Southern Hemisphere D. high pressure, Northern Hemisphere
Layered _________________ exposed by erosion can be seen when looking at the Grand Canyon in the United States.
Fill in the blank(s) with the appropriate word(s).
Atmospheric nitrogen
A) is highly reactive. B) owes its existence to the actions of micro-organisms. C) stays in the atmosphere for a long time. D) was mostly captured from outer space by the Earth's gravitational field. E) has a molecular weight that is higher than that of oxygen.