Materials-recovery facilities discourage consumers from producing trash.
Answer the following statement true (T) or false (F)
False
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Over the past two decades, the harvesting of fuelwood has
A) increased and is causing a worsening problem of deforestation and erosion. B) declined, as developing nations use charcoal and fossil fuels and has become less of a threat to ecosystem sustainability. C) become a major industry in the United States, especially in urban areas, replacing fossil fuels in many regions. D) shifted from productive to consumptive use.
Where did most of the water on Earth likely come from?
A. Water came equally from comets and out-gassing. B. Water came mostly from comets. C. Water came mostly from out-gassing.
Which of the following atmospheric constituents has the least ability to absorb heat on a per-mole basis?
A) Carbon dioxide (CO2) B) Methane (CH4) C) Nitrous oxide (N2O) D) Chlorofluorocarbons (CFCs) E) Ozone (O3)
Artificial levees built along a stream
A. reduce stream stages by moving water faster. B. effectively stop all flooding, as along the Mississippi River. C. may, if breached, trap floodwaters behind them. D. All of the choices are correct.