Krakatoa is a volcanic island situated in the Sunda Strait ...
Mount Pinatubo is an active stratovolcano located on the ...
The Yarrow is a medicinal herb, which is plentiful on the ...
Seismometers are instruments that measure motions of the ...
According to the NOAA, 2013 was reported to be the 4th ...
A volcanic crater is a circular depression in the ground ...
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