Define various type of rocks. Give two example of each type of rock.
Answers
Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are (1) igneous rocks, which have solidified from molten material called magma; (2) sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and (3) metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition, texture, and internal structure. These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes.
1 igneous Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite.
2. sedimentary Clastic sedimentary rocks such as breccia, conglomerate, sandstone, siltstone, and shale.
3. Metamorphic Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble.
Explanation:
These classes are
(1) Igneous rocks, which have solidified from molten material called magma. E.g = Granite ,Garbbo.
(2) Sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions.i.e formred by the deposition of sediment of Metamorphic and Igneous rock. E.g = Limestone , sandstone.
(3) Metamorphic rocks, which have been derived from either igneous or sedimentary rocks ,if we describe about it formation by the specific condition like pressure and temptature on the Igneous or sedimentary rock which changes the appearance and components. E.g = phyllite, schist, gneiss.
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