How can hydrogen gas be produced via the use of solar energy? How might hydrogen be collected and stored to meet the need for fuel for transportation in the future?
What will be an ideal response?
"We would start by building arrays of solar-trough or photovoltaic generating facilities in the deserts of the southwestern United States, where land is cheap and sunlight plentiful. The electrical power produced by these methods would then be used to produce hydrogen gas by electrolysis. The most efficient way to move the hydrogen is through underground pipelines; hundreds of miles of such pipelines already exist where hydrogen is transported for use in chemical industries."
"An alternative to burning hydrogen in conventional internal combustion engines uses hydrogen in fuel cells to produce electricity and power the vehicle with an electric motor. Fuel cells are devices in which hydrogen or some other fuel is chemically recombined with oxygen in a manner that produces an electrical potential rather than initiating burning."
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The propagation of seismic waves through Earth's interior provides evidence of internal layering. The first boundary discovered was the boundary between the
A. inner and outer core. B. outer core and the mantle. C. mantle and the crust. D. upper and lower mantle.
How much of the region experiences average annual rainfall of less than 250 millimeters (10 inches)?
A) 75%
B) 80%
C) 60%
D) 55%
E) 85%
Which of the following is true about the trade in animals and animal parts?
A) investors "bank" on extinction of elephants B) tigers are wanted for medicine C) Slow Loris is an endangered species D) CITES treaty bans ivory trade E) investors "bank" on extinction of elephants; tigers are wanted for medicine; Slow Loris is an endangered species
What was not a factor in making the mapping of the Earth's ocean more difficult?
a. The water covering our planet b. The clouds in the atmosphere c. Technology to measure depths d. The gravitational pull of underwater features