Who is the discoverer of sea-floor spreading?
a. Alfred Wagener
b. Harry Hess
c. James Hutton
d. Charles Darwin
Answer: b. Harry Hess
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________ is to Canada as ________ is to the United States
A) French; Spanish B) English; French C) French; English D) Conflict over ethnicity; conflict over language E) Alaska; Greenland
Which of the following is most important in determining if a material will be a solid, a liquid or a gas?
A) covalent bonds B) intermolecular forces C) intramolecular forces D) nuclear forces
Which of the following hold the chains of an immunoglobulin together?
A) disulfide bridges B) hydrogen bonding C) hydrophobic interactions D) ionic bonds
California's Central Valley is an important agricultural area for U.S. fruit and vegetable production. Because of the semiarid climate there, farmers must irrigate their crops. Which environmental problem do you anticipate as a result?
A) Saltwater contamination B) Fluvial erosion C) Land subsidence D) Water acidification