biogenic
biogenic Applied to the formation of rocks, traces (fossils), or structures as a result of the activities of living organisms (e.g. on the Isle of Wight, Britain, some of the calcium carbonate in rocks was formed from the remains of the fruits of the aquatic green alga (stonewort) Chara species).
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Sill , Sill
A sill is a formation of igneous rock found in features such as mesas, hogbacks, and cuestas. Although sills can become exposed, sills are forme… Cleavage , cleavage
1. In minerals, cleavage is evident when crystals split along planes of weakness inherent in the structure of their atomic lattices. Cleavag… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Dike , Dike
A dike is a formation of igneous rock that can form exposed vertical or linear ridges. Dikes are formed underground and are an intrusive plutoni… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly…
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biogenic