Describe energy flow through a generalized marine trophic system
Energy is captured through photosynthesis or chemosynthesis by autotrophs or primary producers. Primary producers are eaten by heterotrophs called primary consumers, which are in turn eaten by secondary consumers. Consumers which have no predators themselves are called top consumers. There are many small primary producers at the base of the trophic pyramid, and a very few large top consumers at the apex. Only about 10% of the energy from the organisms consumed is stored in the consumers as flesh, so each level is about one tenth the mass of the level directly below it. The rest of the energy is lost as waste heat as organisms live and work to maintain themselves.
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Electrons flowing in an electric circuit move by
A. colliding with molecules. B. interacting with an established electric field. C. bumping other electrons. D. none of the above
The tapering off of a process, pattern, or event over a distance is known as:
A) intervening opportunity. B) transferability. C) distance decay. D) mobility. E) time-space convergence.
Which of the following is considered a softcopy map?
A. a map to be posted on the Internet B. a map to be used in a PowerPoint presentation C. a printed map D. both a map to be used in a PowerPoint presentation and a map to be posted on the Internet E. both a map to be posted on the internet and a printed map
Tapping just 2% of the hot, dry rock geothermal energy in the United States could produce how much of the country's energy needs?
A. 50% of the energy for electricity B. three-fourths of all energy C. all the energy necessary for electricity D. 10 times the energy needed from coal burning power plants E. 2,000 times the current annual use of electricity