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)