What characterizes the third stage (industrial) of the demographic transition model?
a. Birth rates remained high, but death rates dropped sharply due to medical and other innovations of the Industrial Revolution
b. Birth rates begin to fall as affluence spread
c. Low birth rates and low death rates result in low population growth.
d. Birth and death rates remain high.
e. Population growth declines as birth rates are low and death rates are high.
b
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Which scenario is an example of a feedback effect??
a. ?An earthquake triggers a landslide. b. ?A swarm of small earthquakes was observed before the eruption of Mt. St. Helens. c. ?Melting arctic ice generates warm water which melts more ice. d. ?A flood occurs in a populated area, causing more damage as a result. e. ?A storm front creates hazards from lightning and tornadoes.
One economical drawback of tidal power is that it ____
A) emits an abundance of carbon dioxide into the atmosphere B) ?requires a high initial infrastructure investment C) ?emits particulate matter into the atmosphere D) ?requires a high cost to operate tidal generators
Microscopic crystals of silica form a hard rock called chert, which can be shaped to form sharp cutting edges
Indicate whether the statement is true or false
Which of the following is the best example of a positive feedback effect?
a. ?Melting ice exposes the dark surface of the ocean, which reflects less of the sun’s energy than ice. This heats the water and in turn, melts more ice. b. ?Melting ice exposes the dark surface of the ocean, which reflects more of the sun’s energy than ice. This heats the water and in turn, melts more ice. c. ?Melting ice allows ocean levels to rise and reduce the surface area of the remaining ice, slowing its melting rate. d. ?Aerosols block the sun’s radiation, slowing the melting of ice. e. ?Aerosols cause air pollution, which increases local drought conditions.