Rocks

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Rocks

  1. 1. ROCKS Presented By MD NURUDDIN SURVI SONL B.TECH(BIOTECH) SHARDA UNIVERSITY
  2. 2. What are Rocks? A rock is a naturally occurring solid mixture of one or more minerals, or organic matter Rocks are classified by how they are formed, their composition, and texture Rocks change over time through the rock cycle
  3. 3. Igneous Rocks Igneous rock begins as magma. Igneous rock is formed through the cooling and solidification of magma or lava. Magma freezes between 700 °C and 1,250 °C Magma is a mixture of many minerals
  4. 4. Extrusive and Intrusive rocks At the surface, lava hardens to form extrusive rocks with tiny crystals or glassy texture. Beneath the surface, magma hardens to form intrusive rocks with easily visible crystal texture.
  5. 5. Sedimentary RocksSedimentary rocks form when sediments harden into rocksThree Types:1. Clastic: formed from fragments of other rocks.2. Chemical: formed from mineral grains that come out of solution.3. Organic: formed from the remains of plants/animals.
  6. 6. Metamorphic Rock Meaning to change shapeMetamorphic rocks“morph” (change) fromexisting rock, due to heat,pressure and chemicals. Usually takes place deep in the Earth
  7. 7. Types of metamorphism Regional Metamorphism: large areas of rock are under intense heat/pressure, which occurs during mountain-building. Contact Metamorphism: when hot magma forces itself into overlying rock (intrusions) and bakes the rock
  8. 8. Metamorphic Rock Foliated - contain aligned grains of flat mineralsGneiss is foliatedmetamorphic rockthat has a bandedappearance and ismade up of granularmineral s.
  9. 9. Metamorphic Rock Non-Foliated – mineral grains are not arranged in plains or bandsMarble is a non-foliatedmetamorphic rockthat is producedfrom themetamorphism oflimestone.
  10. 10. THE ROCK CYCLEThe three types of rocks are very closely related: Igneous rocks are attacked by erosion and weathering to form sediments Crustal movements can cause deep rocks to reach high temperatures and to melt back into magma Igneous and sedimentary rocks exposed to intense heat and pressure can become metamorphic

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