Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________
A) the car driven
B) governmental incentives for research
C) the source of energy used to produce the hydrogen
D) the source of oxygen used for the process
C
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Trees in mountain areas hundreds of miles from coal burning power plants are being killed by the effects of _______ rain.
Fill in the blank(s) with the appropriate word(s).
One of Edwin Hubble's discoveries is that the known universe is expanding. This means that
A) most all observable galaxies are moving away from each other. B) light rays bend as they near the event horizon of a black hole. C) light rays undergo acceleration as they travel vast distances. D) the mass of the universe is slowly dissipating.
All of the following are ways in which states shape economies EXCEPT
A) creation and enforcement of laws. B) setting fiscal and monetary policy. C) through its uneven expenditures across the landscape. D) construction of infrastructure. E) through military intervention.
Why is there salt in the oceans?
A. Precipitation B. Runoff from the continents C. Comets D. Melting of ice at the Poles