A green vitreous mineral formed by a meteorite impact and considered a tektite
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Tag: <span>M</span>
A combustible gas formed through the decomposition of organic matter, CH4
A portion of the Earth between the crust and upper mantle. Named after Andrija Mohorovi?i?
Partially metamorphosed volcanic rocks
To surround with a trench or ditch, usually purpose built to hold water
A sulphide ore of arsenic, arsenopyrite. FeAsS
A geological time, 24 million to 5 million years ago, during which modern mammals and birds appeared
A movement of aqueous debris, soil, sand gravel and/or rocks
Broken rocks or loose earth
The study of crystal formation