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Seismometers choose one: a. measure vertical (up-and-down) ground motion but cannot measure horizontal (back-and-forth) motion. b. are only sensitive enough to record ground movements down to about 1 mm. c. can "feel" (or record) large earthquakes that happen on the opposite side of the world. d. begin recording when the ground shakes and surface waves arrive.
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Seismometers choose one: a. measure vertical (up-and-down) ground motion but cannot measure horizon...
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