GEOGRAPHY ALL ABOUT ROCKS HINDI /ENGLISH
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GNEOUS ROCKS The word igneous has been derived form a Latin word 'ignis' meaning thereby fire. Igneous rocks are also called primary rocks because these were originated first of all the rocks during the formation of upper crust of the earth. On cooling, solidification and crystallization of hot and liquid magma after the origin of the earth. This is why igneous rocks are also called as parent rocks.
CHARACTERISTICS OF IGNEOUS ROCKS Igneous rocks are granular or crystalline rocks. Igneous rocks o not have strata. Igneous rocks do not contain fossils. Igneous rocks are mostly associated with the volcanic zones.
TYPES OF IGNEOUS ROCKS INTRUS VE IGNEOUS ROCKS EXTRUSIVE IGNEOUS ROCKS PLUTONIC IGNEOUS ROCK HYPABYSSAL IGNEOUS ROCKS
INTRUSIVE IGNEOUS ROCKS When the rising magma during a volcanic activity do not reach the earth's surface rather they are cooled and solidified below the surface of the earth. PLUTON C GNEOUS ROCK :-are formed due to cooling of magmas very deep inside the earth. the plutonic igneous rocks are very coarse-grained rocks. Granite is best representative example of this category
HYPABYSSAL IGNEOUS ROCKS :-are formed due to cooling and solidification of rising magma during volcanic activity in the cracks, pores, crevices and hollow place just beneath the earth's surface. The magma are solidifies in different forms depending upon the hollow place places such as batholiths, laccoliths, phacoliths, lopoliths, sills, dikes etc. These are different shapes of solidified magma.
EXTRUSIVE IGNEOUS ROCKS EXTRUS VE GNEOUS ROCKS:-The igneous rocks formed due to cooling and solidification of hot and molten lavas at the earth's surface are called extrusive igneous rocks. Generally extrusive igneous rocks are formed during fissure eruption of volcanoes resulting into flood basalts. extrusive igneous rocks - Gabbro
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