Why is there salt in the oceans?
A. Precipitation
B. Runoff from the continents
C. Comets
D. Melting of ice at the Poles
Answer: B
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The new center of finance and banking in Shanghai is
A. The Bund B. Nanjing Road C. Dongling D. Pudong
What community typically has the highest biomass per unit of surface area?
a. rocky intertidal b. estuary
c. sandy beach d. deep ocean e. open ocean
The farm machinery that opens a furrow through the soil and mulch of dead weeds, drops seeds and fertilizer and then closes the furrow is engaged in the erosion-reducing technique of
A) creating shelterbelts and chemically fertilizing the soil. B) creating strip cropping in one operation. C) no-till planting. D) organic pest control.
Why did coal replace wood as the dominant fuel source?
A. It is easier to find. B. It is more energy dense. C. It is easily converted to a liquid. D. It is less expensive to produce.