The location on Earth's surface directly above an earthquake's focus is called
a. the shadow zone.
b. the epicenter.
c. ground zero.
d. the subduction zone.
b
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In chemistry, reduction occurs when a substance
A) accepts electrons B) loses electrons C) rearranges its electrons internally D) breaks into its constituent atoms
A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J. The efficiency of the jack system is at most
A) 10%. B) 20%. C) 50%. D) 80%. E) not enough information
The emission line for a given atom shows spectral features at the ________ location as in its absorption spectrum
Fill in the blank(s) with correct word
The basic idea of the "string" hypothesis is that the fundamental particles are
A) very tiny hollow spheres. B) tiny loops of infinitely slender material. C) just geometric points (infinitely tiny points). D) made of chocolate fudge. E) infinitely long and infinitely slender objects.