Coal is considered to be a
A) biochemical sedimentary rock.
B) clastic sedimentary rock.
C) fossiliferous sedimentary rock.
D) chemical sedimentary rock.
Answer: A
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Answer the following statement true (T) or false (F)
The net force acting on an insect falling downward at constant velocity is
A) zero. B) the weight of the insect. C) upward air resistance. D) none of the above
A clown at the circus blows up a balloon with helium. This balloon will not float to the ceiling unless
A. the pressure of the helium inside the balloon is less than the atmospheric pressure. B. the balloon and the helium it contains weigh less than the air displaced by the balloon. C. the pressure of the helium inside the balloon is greater than the atmospheric pressure. D. the weight of the balloon is less than the weight of the air displaced by the balloon.
Except for the lightest nuclei, the average binding energy per nucleon is about
A) 12 MeV. B) 4 MeV. C) 6 MeV. D) 10 MeV. E) 8 MeV.