This wind-blown dust deposit (loess) from Tibet
A. forms a world-wide layer associated with a well-known extinction of dinosaurs.
B. was deposited by a huge flood of seawater that covered the land at the time of the dinosaurs.
C. began as clay and silt that were produced by grinding of rocks along ice-age glaciers.
D. All of these.
Answer: C
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A) Forked caudal fin B) Heterocercal caudal fin C) Lunate caudal fin D) Rounded caudal fin E) Truncate caudal fin
By the beginning of the Paleozoic Era, six of the seven continents were present
a. True b. False
Contrast nimbostratus and cumulonimbus clouds, paying special attention to their form, conditions of formation, and associated weather
What will be an ideal response?
Dead zones, such as those found in the Chesapeake Bay and the Gulf of Mexico, are a consequence of
a. thermal pollution b. groundwater pollution c. nutrient pollution d. All of the above help create dead zones