What is the name of the super continent that broke up as a result of continental drift to form the modern geography?
A. Atlantis
B. Pangaea
C. Laurentia
D. Gondwanaland
Answer: B
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Metamorphism that occurs when rocks are exposed to the pressure and extreme temperature associated with intruding magma is known as
A) contact metamorphism. B) regional metamorphism. C) intrusive metamorphism. D) extrusive metamorphism.
Mechanisms that enhance or drive change are known as ________
A) negative feedback mechanisms B) open feedback mechanisms C) positive feedback mechanisms D) closed feedback mechanisms
When food is irradiated with gamma rays from a cobalt-60 source, does the food become radioactive? Why?
A) Yes. This is why irradiation with cobalt-60 is no longer approved by the FDA. B) Yes. However, the radioactivity resulting is well below the danger level established by the FDA. C) No. The gamma rays do not have sufficient energy to initiate the nuclear reaction in the atoms of the food. D) Yes and No. Although the gamma rays initiate the nuclear reaction the radioactivity does not show up until the food is ingested.
During the Pleistocene, Earth’s temperature was relatively static although it was cooler than today
a. True b. False