Krakatoa is a volcanic island situated in the Sunda Strait ...
Any object that orbits a celestial body, such as a moon. ...
According to the NOAA, 2013 was reported to be the 4th ...
An earthquake's hypocenter is the position where the ...
The underground river that flows 13,000ft below ground ...
In seismology, the depth of focus refers to the depth at ...
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