"If you turned off every video game system, car stereo, and TV on the planet, and if everyone held their breath and didn’t make a peep, there would still be a sound, though you couldn’t exactly hear it. You may not know it, but the Earth is always emitting a low hum, which geophysicists call the free oscillation of the Earth. In a recent study, geophysicists have measured Earth’s background hum on the ocean floor for the first time. That’s right, the Earth makes noises constantly, even when it’s not rumbling or cracking ..." (read more)
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