Volcanoes "scream" before they erupt. And they also have a heartbeat of sorts. Listen to these surprisingly intense sounds emitted by a volcano in Alaska before it erupted. The first recording condenses 10 minutes of audio into 10 seconds, so you can hear the pre-eruption scream:
The second recording is of 10 hours of pre-eruption mini earthquakes condensed into one minute of audio.
The pause right before the eruption is Mother Nature dropping the beat. (via @DavidGrann)
