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TYPES OF ROCKS

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Rocks:---- Rocks ,naturally occurring solid material consisting of one or more minerals. Rocks are everywhere in the ground, forming mountains and at the bottom of ... – PowerPoint PPT presentation

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Title: TYPES OF ROCKS


1
TYPES OF ROCKS
2
MEANING OF ROCKS
  • Rocks---- Rocks ,naturally occurring solid
    material consisting of one or more minerals.
    Rocks are everywhere in the ground, forming
    mountains and at the bottom of the oceans.

3
TYPES OF ROCKS
  • Rocks are divided into three main types, Based on
    the ways in which they form are as following
  • Igneous Rocks
  • Sedimentary Rocks
  • Metamorphic Rocks

4
Igneous Rocks
  • Igneous rocks Igneous rocks are made of old
    rocks that have melted within the earth to form
    molten material called magma.

5
Sedimentary Rocks
  • Sedimentary rock forms when loose sediment, or
    rock fragments, hardens.
  • Geologists place sedimentary rocks into three
    broad categories
  • 1. Clastic Rocks
  • 2.Chemical Rocks
  • 3.Organic Rocks

6
  • Clastic rocks which form from clasts,or broken
    fragments, of pre-existing rocks and materials.
    The most common types of clastic rocks are
    sandstone and shale, also known as mudrock.
  • Chemical rocks which form when minerals
    precipitate, or solidify, from a solution,
    usually seawater or lake water. The most common
    type of chemical rocks are called evaporites
    because they form by evaporation of lake water.
  • Organic Rocks Which form from accumulations of
    animal and plant remains. The most common organic
    rocks are Limestone and Coal.

7
Metamorphic Rock
  • Metamorphic rock forms when extreme temperatures
    and pressures deep within the earth alter the
    mineralogical or structural aspects of existing
    rock and change it into metamorphic rock.

8
Project made by Smt.Amarjit Kaur S.S.Mistress Gu
ided ByMiss Hardeep Kaur Govt.Sr.Sec.School
KOHALI(Amritsar)
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