The most costly aspect of photovoltaic technology is being addressed by
A) inventing a way to convert alternating current to direct current.
B) inventing a way to convert direct current to alternating current.
C) finding a way to reduce the damaging effects of the sun on solar panels.
D) new technologies that reduce the cost of manufacturing solar cells.
D
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The fertile area between the Tigris and Euphrates rivers is referred to as ___________________.
Fill in the blank(s) with the appropriate word(s).
Astronauts deployed a solar wind measuring experiment on the Moon because
A) the lunar surface is protected by an atmosphere. B) there is no electromagnetic energy arriving there. C) the solar wind does not reach the Earth's surface. D) no one else had attempted the experiment before and they wanted to be the first.
Which two uses consume most freshwater in the United States?
A. irrigation and drinking water B. irrigation and thermoelectric power C. drinking water and showering D. mining and raising livestock E. mining and industrial use
Which of the following nutrients can be absorbed directly?
A) fats B) proteins C) starch D) vitamins