The high concentration of iridium at the Cretaceous Tertiary boundary is most likely attributed to
A) a worldwide rise in sea level.
B) meteorite bombardment.
C) an out flux of iridium from Earth's interior.
D) none of the above
Answer: B
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Although astronomers refer to the Galaxy's disk as rotating, the motion is really due to the ________ motion of each of the objects in the disk
Fill in the blank(s) with correct word
A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
A. 94 lb B. 88 lb C. 63 lb D. 75 lb E. 150 lb
Why are ores so valuable?
A) They are sources of naturally occurring gold. B) Metals can be efficiently extracted from them. C) They tend to occur in scenic mountainous regions. D) They hold many clues to Earth's natural history.
Two coherent waves, each with amplitude A, reach the same point in phase. The amplitude of the superposed wave is
A. 0. B. A. C. 2 A. D. 3 A. E. 4 A.