A rock or boulder usually transported by erosion, usually emplaced outside its origin
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Category: <span>E</span>
A green variety of beryl, sapphire or tourmaline used as a gemstone
The breaking down of rock and material by usually natural forces of water and gravity
An elevated earth structure influenced by a linear path of erosion
A geological measurement in time during which corresponding rock types were formed in, and a period only exceeded in length by an eon
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