Subject: Classifying Rocks

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SubjectClassifying Rocks

• Mr. Mathews 6th Grade Earth Science

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Main Idea Details

• A. Origin

• Where and how the rock is formed

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Main Idea Details

• B.Texture

• Size, shape, and pattern of rocks grains

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Main Idea Details

• C. Grains

• Particles of minerals or other rocks.

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Main Idea Details

• 1. Grain Size

• Fine, Medium, Coarse

Shale Granite Conglomerate
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Main Idea Details

• 2. Grain Shape

• Jagged or Rounded

Breccia
Conglomerate
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Main Idea Details

• 3. Grain Pattern

• Wavy, Flat Layers, Random (no pattern)

Gneiss Sandstone Granite
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Main Idea Details

• 4. No Visible Grain

• Smooth and Shiny

Obsidian
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Main Idea Details

• 1. Igneous Rock

• Forms from the cooling of molten rock (magma
  and/or lava).

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Main Idea Details

• 2. Sedimentary
• Rock

• Forms when particles of minerals and/or rocks,
  animals, or plants are cemented together.

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Main Idea Details

• 3. Metamorphic Rock

• Formed when a rock is changed by heat and
  pressure.

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Summary

• Rocks are grouped into three different
  categories igneous, sedimentary, and
  metamorphic. Scientists group rocks by origin,
  texture, which is determined by grain size,
  shape, and pattern.