The main direction in which groundwater flowed in the Investigation area was to the
A) north.
B) east.
C) south.
D) west.
D) west.
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Sheet lightning
A) does not require a separation of charge. B) is visible as sharp streaks of lightning arcing through the sky. C) occurs when the electrical resistance in the air overcomes the voltage gradient within a cloud or between clouds. D) accounts for the majority of all lightning events.
Laws restricting construction in areas of geologic hazard
A. are an important concern of the Environmental Protection Agency. B. have not yet been enacted because of vocal citizen opposition. C. are unnecessary because, now that hazards are well recognized, people naturally avoid the dangerous areas. D. typically apply only to new construction in an area, not to existing buildings.
The most important function of the ozone layer in the stratosphere is
A. conversion of oxygen to O3. B. absorption of incoming UV radiation from the sun, that otherwise would increase the risk of skin cancer. C. maintenance of the Earth's magnetic field. D. destruction of CFCs, that otherwise would accumulate in the atmosphere and cause increased incidence of lung cancer.
Ecological modeling can help us ________ ecosystem services
A) understand B) create many new C) control the growth of D) replace destroyed E) decrease the cost of maintaining