A seismograph works:
A) with the aid of electrodes inserted in the Earth to detect fluctuations in electrical conductivity caused by vibrations.
B) via a stationary satellite that is aimed at a specific point on the Earth's surface to detect the slightest tremors.
C) by triggering a spring- loaded mechanism during an earthquake.
D) by means of a freely suspended weight that tends to remain stationary when the Earth vibrates.
Correct Answer:
Verified
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