This wind-blown dust deposit (loess) from Tibet
A) was deposited by a huge flood of seawater that covered the land at the time of the dinosaurs.
B) began as clay and silt that were produced by grinding of rocks along ice-age glaciers.
C) forms a worldwide layer associated with a well-known extinction of dinosaurs.
D) All of these are correct.
B) began as clay and silt that were produced by grinding of rocks along ice-age glaciers.
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Corn-based ethanol production has a number of drawbacks, including ________
A) substantial inputs of fossil fuel energy B) depletion of fresh water C) increased use of pesticides D) increased use of fertilizers E) all of the above are drawbacks of corn-based ethanol production
The solar constant is about ____________________/calories per square cm per minute
Fill in the blank(s) with correct word
Which numbered feature(s) on this photograph are consistent with the presence of glaciers sometime in the past?
A. 2, U-shaped valley B. 1, an arête C. 3, tarn D. All of these choices are correct.
The death rate cannot tell us about the quality of life or health in a country.
a. true b. false