The formation of protons over neutrons (thus producing about a 7:1 ratio) was favored in the early universe because
A. the positively charged protons were repelled away from the explosion.
B. the more massive neutrons made better targets for nucleon collisions.
C. it takes more energy to create a neutron from a proton than a proton from a neutron.
D. it takes more energy to create a proton from a neutron than a neutron from a proton.
Answer: C
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Why are earthquakes mainly found at the edges of plates?
a) Earthquakes drive the plate motion b) That is where plates rub together c) Volcanic activity occurs at the plate edges d) Breakage and deformation of the lithosphere are focused at plate edges e) Convection causes mantle upwelling and downwelling at plate edges
The center of gravity of a baseball bat is
A. in its center. B. closer to the handle. C. closer to the heavy end. D. slightly away from its center of mass.
High clouds are those that form at altitudes of at least:
A) 32,800 ft (10,000 m). B) 20,000 ft (6000 m). C) 65,617 ft (20,000 m). D) 6500 ft (2000 m).
If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature
A) increases. B) decreases. C) neither A nor B