Photovoltaic cells work because solar energy striking their surface
A. Changes to chemical energy
B. Is collected in the form of photons and sent through attached wires
C. Causes the cells to liquefy as they heat
D. Releases electrons, causing an electric potential in attached wires
E. Causes an uneven magnetic charge to develop
Answer: D
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The European population is characterized by which stage of the demographic transition?
A) First B) Second C) Third D) Fourth E) Fifth
Flea beetles alone are unlikely to eliminate all of the leafy spurge in a region. Instead, the number of leafy spurge plants and the number of flea beetles in a particular community may stabilize
At this point, both the leafy spurge and flea beetle populations A) have exhibited exponential growth followed by a crash. B) have experienced constant growth. C) are still experiencing exponential growth. D) are experiencing environmental resistance.
According to the ________, the Earth and solar system began to form nearly 5 billion years ago from the gravitational collapse of a huge cloud of dust and gases
A) big bang theory B) plate tectonic theory C) uniformitarianism D) nebular theory
Sinkholes can result from ________
A) building on floodplains B) flood damage and chemical erosion C) substrates that become weak following rain D) poorly drilled wells in soft soils E) overconsumption of water from aquifers