Earth
The Crystal Cave In Mexico
Published June 21, 2016
Cueva de los Cristales in Mexico is a cave filled with gigantic crystals. Scientists wear suits filled with ice to cope with the heat in the cave.
The crystals are made of selenite - a transparent form of gypsum. They grew while the cave was filled with water, which it would be again if the scientists would stop pumping out water from it.
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