LEQ: What characteristics do geologists observe to classify, group, and identify rocks? Part 2 - PowerPoint PPT Presentation

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LEQ: What characteristics do geologists observe to classify, group, and identify rocks? Part 2

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* Igneous Rocks Form from the cooling and hardening of molten rock. Either magma (below Earth s surface) or Lava (above Earth s surface) ... – PowerPoint PPT presentation

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Title: LEQ: What characteristics do geologists observe to classify, group, and identify rocks? Part 2


1
LEQ What characteristics do geologists observe
to classify, group, and identify rocks? Part 2
  • Key Terms texture, grain, igneous rock,
    sedimentary rock, metamorphic rock

2
Studying Rock Samples Review
  • When studying a rock sample, geologists observe
    the 3 characteristics of the rock.
  • Color
  • Texture
  • Mineral Composition

3
Using these characteristics, geologists can
classify and group rocks according to how and
where the rock forms.
4
Groups of Rocks
  • Three major groups of rocks
  • Igneous Rocks
  • Sedimentary Rocks
  • Metamorphic Rocks
  • Each group forms in a different way.

5
Igneous Rocks
  • Form from the cooling and hardening of molten
    rock.
  • Either magma (below Earths surface) or
  • Lava (above Earths surface)
  • How Igneous Rocks form

6
Sedimentary Rocks
  • Form when particles of other rocks or the remains
    of plants and animals are pressed and cemented
    together.
  • Form in layers below Earths surface.
  • Observe how sediment is deposited
  • Observe how sediment is cemented

7
Metamorphic Rocks
  • Form when an existing rock is changed by heat,
    pressure, or chemical reactions.
  • Form deep under Earths surface
  • Observe how heat and pressure change a rock into
    a metamorphic rock.

8
Quia Practice
  • Link to our Quia class page, and log in.
  • Try the columns activity until you can match the
    type of rock with the processes without any
    problem.
  • When complete, try some of the other activities
    focused towards our current chapter on Rocks.
  • Our Quia Class Page
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