What is considered the "keystone" species of the Antarctic ecosystem?
a. krill
b. dinoflagellates
c. copepods
d. cyanobacteria
e. diatoms
a
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The energy that allows tectonic plates to interact on the earth's surface is supplied by:
A. the sun. B. the molten interior. C. greenhouse gases. D. ocean currents.
What causes the winds of a hurricane to be so fast?
A) stronger Coriolis force B) tidal effects C) coupling with the jet stream D) weaker Coriolis force E) very strong pressure gradient force
Markovnikov's rule is useful to predict the outcome of the reaction of hydrogen chloride with which of the following alkenes?
A) 1-butene B) 2-butene C) both a and b D) neither a nor b
Different periods of the geologic time scale are different in length. Why?
A) The geologists who developed the time scale did not care about absolute ages. B) Early geologists made mistakes, but it was easier to retain the terminology in the time scale. C) The time scale was developed ad hoc, as a relative time scale based on rocks and fossil succession with no reference to absolute time when it was developed. D) None of the above