The planet Earth loses heat mainly by
A) conduction.
B) convection.
C) radiation.
D) all of the above
C
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The best evidence that the Sun is a newcomer in the universe is
A. the existence of heavy elements in its composition. B. its relatively slow rate of spin. C. its position in the galaxy. D. its very existence in spite of its high burning rate. E. its high temperature as revealed by its color.
Recycling rates for some MSW categories have increased in the U.S. partly because of
A. inclusion of environmental costs in market prices. B. the prevalence of MRFs. C. tax breaks for mining virgin materials. D. fluctuations in the price of recycled materials. E. a rise in the number of curbside recycling programs.
The basins of the Great Lakes were carved by running water during interglacial periods. Indicate whether the statement is true or false
Which of the following is a correct example of global warming creating a positive feedback?
A. Warming oceans release more water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature. B. Warming oceans release less water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature. C. Less water evaporating will create more high level clouds, causing the surface to warm. D. Warming air melts permafrost releasing methane, a natural absorber of potent greenhouse gases.