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IGNEOUS ROCKS

IGNEOUS ROCKS. DEFINITION. Igneous rocks are formed out of hot larva or magma. The extruded larva on solidification over the earth’s surface gives rise to extrusive igneous rock. The magma on solidification below the earth’s surface is called intrusive rock. MOLTEN MAGMA.

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IGNEOUS ROCKS

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  1. IGNEOUS ROCKS

  2. DEFINITION Igneous rocks are formed out of hot larva or magma. The extruded larva on solidification over the earth’s surface gives rise to extrusive igneous rock. The magma on solidification below the earth’s surface is called intrusive rock.

  3. MOLTEN MAGMA

  4. INTRUSIVE AN EXTRUSIVE IGNEOUS ROCKS

  5. INTRUSIVE IGNEOUS ROCK • The molten magma under the earth’s surface gets solidify there itself to form the intrusive igneous rock. • It has high pressure and temperature. it cools slowly Also known as plutonic rock. Granite

  6. EXTRUSIVE IGNEOUS ROCK • When the molten magma goes out as volcano and then solidify is known as extrusive igneous rock. • It cools relatively fast. • It has high temperature and pressure. Rhyolite

  7. COMPLEX IGNEOUS ROCK • These rocks cools at the intermediate level that is not above or below the earths surface. Basalt

  8. INTRUSIVE ROCK CONCODANT DISCORDANT

  9. SILLS When the magma solidifies as a thin sheets or layers is called sills.

  10. PHACOLITS • When the magma is under low pressure it will not exert much pressure to make space for itself.

  11. LACOLITS • When the magma gets intruded into the layer due to high viscosity it may not spread eventually forming domes.

  12. DYKES • When the magma moves vertically hence forming a wall like structure is known as dykes.

  13. VOLCANIC NECKS • The magma gets solidified in the inactive volcanic areas in the form of thick pipes is called volcanic necks.

  14. BATHOLITHS • When the magma moving under high pressure forming huge mass of igneous rock.

  15. STRUCTURE OF IGNEOUS ROCK primary secondary

  16. PRIMARY STRUCTURE • Flow structure • Pillow structure • Blocky and ropy structure • Spherulitic structure • Orbicular structure • Rift and grain structure • Tension joints • Vesicular structure • Miarolitic structure

  17. USES • Granites posses excellent qualities of building rocks for structural as well as architectural purposes. • They have high crushing strength. • Has least porosity. • Used in decorative purposes. • Could get in variety of colours.

  18. THANK YOU

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