A geological measurement in time during which corresponding rock types were formed in, and a period only exceeded in length by an eon
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Category: <span>E</span>
A geological measurement in time during which corresponding rock types were formed in, and a period only exceeded in length by an eon
Mineral deposits consisting of veins and replacement bodies, often containing metallic minerals of a higher densities on the periodic table of elements, and transported by intense volcanic activity
A common secondary constituent of igneous rock, a silicate of aluminum, calcium, and iron
A point on the Earths surface reflecting the centre of an earthquake as measured by seismic activity
The largest division of geological time, counting as two or more eras, and considered to cover a span involving a hundred million to a billion years or more
A deposit of minerals influenced by the wind
The Eocene epoch was a period in time, thought to be 58-37 million years ago, when mammals first emerged
A report that examines the effects of mining on its natural environment
A rock with a water filled cavity