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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

The new center of finance and banking in Shanghai is

A. The Bund B. Nanjing Road C. Dongling D. Pudong

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences