Isotopic analysis of a rock can tell us
A) what the rock is made of
B) the detailed geological history of the rock
C) the temperature and pressure conditions under which it formed
D) when the rock formed
D
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Which statement about pulsars is not thought to be true?
A) All pulsars are neutron stars, but not all neutron stars are pulsars. B) Pulsars can form only in close binary systems. C) A pulsar must have a very strong magnetic field and rotate quite rapidly. D) Pulsars are kept from collapsing by neutron degeneracy pressure.
The air in a pipe resonates at 120 Hz and 600 Hz, one of these resonances being the fundamental. If the pipe is open at both ends, how many resonances are between the two given ones, and if the pipe is closed at one end, how many resonances are between the two given ones?
a. open: 3; closed: 1 b. open: 1; closed: 3 c. open: 2; closed: 0 d. open: 0; closed: 2 e. open: 5; closed: 1
Different samples of a pure compound always
contain the same elements in a) exactly equal amounts. b) the same proportion by volume. c) the same proportion by mass. d) varying proportions depending on the temperature.
The process in which one plate bends and descends beneath another plate is called
A) subduction. B) seduction. C) segregation. D) sinking.