How many valence electrons does boron (B, atomic no. = 5 ) have?
A) 1
B) 2
C) 3
D) 4
E) 5
C
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Why doesn't uranium ore spontaneously undergo a chain reaction?
A. Uranium ore must be "weapons' grade" in order for it to undergo chain reaction. B. Uranium ore is mostly non-fissionable isotope U-238 and undergoes a chain reaction only if mixed with a moderator to slow down the neutrons. C. Uranium ore, mostly U-235, must be enriched with U-238 in order for it to undergo a chain reaction. D. Uranium ore does spontaneously undergo slow chain reaction over time finally resulting in it becoming lead.
Where have scientists found evidence of Earth's magnetic field reversals?
a. Subduction zones b. Continental-continental collisions c. Transform boundaries d. Spreading centers e. Himalayas
Generally speaking, how does the chemical composition of most metamorphic rocks compare to that of the parent rock?
A) Their chemical composition will be nearly the same. B) In order to be a metamorphic rock, the chemical composition must change by 50 percent. C) There will be a complete compositional change. D) Knowing the chemical composition is not necessary to understand metamorphic rocks.
If ice flow in a glacier ceases, ____
a. the glacier will continue to grow b. the glacier is no longer considered active c. accumulation is still taking place d. the glacier is no longer calving