Rock Cycle Unit Vocabulary 7th Grade Science

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Rock Cycle UnitVocabulary7th Grade Science
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Weathering

• The breaking down of Earths materials by natural
  processes (water, wind, ice, chemicals, etc.)
  into smaller pieces or sediments

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Erosion

• Weathered rock and soil particles are moved from
  place to place by water, wind, or ice

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Deposition

• Weathered sediments are laid down in a new
  location helping create new landforms or rocks

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Melting

• Caused by heat and pressure around the rock to
  form magma

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Solidification

• Magma or lava cools and hardens

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Recrystallization

• Through heat and pressure, the rocks atoms and
  crystals are rearranged

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Igneous Rock

• Formed from the cooling and solidification of
  magma or lava
• 2 Types
• Extrusive Igneous Rock
• Intrusive Igneous Rock

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Extrusive Igneous Rock

• Formed above ground from lava cooling and
  hardening
• Characteristics from Cooling Quickly
• Small or no crystals
• Fine-grained texture

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Intrusive Igneous Rock

• Formed below ground from magma cooling and
  hardening
• Characteristics from Cooling Slowly
• Large or small crystals
• Coarse-grained texture

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Sedimentary Rock

• Formed from sediments (rock fragments, mineral
  grains, animal or plant remains) that are pressed
  or cemented together
• 3 Types
• Clastic Sedimentary Rock
• Organic Sedimentary Rock
• Chemical Sedimentary Rock

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Law of Superposition

• States that layers and fossils on top are younger
  than lower layers
• Strata horizontal layers formed from deposited
  sedimentary rock
• Stratification process of arranging sedimentary
  rocks into layers

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• Volcano
• Roots here!

Youngest Rocks Here !
Oldest Rocks Here !
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Metamorphic Rock

• Rock changes due to intense heat and high
  pressure then recrystallizes
• Not heated enough to melt the rock
• 2 Types
• Foliated Metamorphic Rock
• Non-Foliated Metamorphic Rock

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Bands (can) Form Foliated
Metamorphic means changed
Metamorphic!
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The Rock Cycle