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Rock Layers

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3 Types of Rocks Igneous A rock formed by the crystallization of magma or lava Metamorphic Formed when the ... The oldest layers of rock can be found ... – PowerPoint PPT presentation

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Title: Rock Layers


1
Rock Layers
  • Observing and Investigating that Rocks are Found
    in Layers
  • By Carly Gallo, Lauren Carney, and Katherine
    Locasto

2
3 Types of Rocks
  • Igneous
  • A rock formed by the crystallization of magma or
    lava
  • Metamorphic
  • Formed when the composition or texture of a rock
    changes because of changing temperature, pressure
    and/or reactions
  • Sedimentary
  • form as layers known as strata

3
Igneous Rocks
Sedimentary Rock
Metamorphic Rock
4
Rock Layers
  • Rock layers, also known as strata, are found
    throughout the Earth. The oldest layers of rock
    can be found on the bottom, while the youngest
    layers of rock are found on top.

5
How Do You Know Which Layers Are Which?
  • Rock layers can be identified by color, thickness
    and resistance to erosion.
  • These are all properties that are linked to the
    composition and origin of the rocks.

6
Nicholas Steno
  • He developed the Principle of Original
    Horizontality, which states that sedimentary
    rocks are originally formed in horizontal layers,
    but sometimes they undergo change and cause them
    to be tilted.

7
Activity Layers of Rock
  • Paleozoic Era 543 Million Years Ago
  • Represented by green cubes
  • Mesozoic Era 245 Years Ago
  • Represented by pink cubes
  • Cenozoic Era 65 Million Years Ago
  • Represented by orange cubes

8
What To Do
  • Build cubes according to the order in which the
    layers formed.
  • After you have formed the layers, create a sketch
    on your blank piece of paper of your rock layers.
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