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Different Types of Rocks and the Rock Cycle. Igneous Rocks. Formed from liquid magma or lava that cools and solidifies either after eruption onto the surface or deep underground. Igneous Rocks. Crystal size of rock depends on how fast it cooled.

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igneous rocks
Igneous Rocks
  • Formed from liquid magma or lava that cools and solidifies either after eruption onto the surface or deep underground.
igneous rocks1
Igneous Rocks
  • Crystal size of rock depends on how fast it cooled.
  • Erupted from a volcano – Cooled very fast  human eye can’t see crystals
igneous rocks2
Igneous Rocks
  • Crystal size of rock depends on how fast it cooled.
  • In a magma chamber underground – Cooled slowly human eye can see crystals
sedimentary rocks
Sedimentary Rocks
  • Formed either as fragments of mineral/fossils that are cemented together or as minerals that are precipitated out of water.
sedimentary rocks1
Sedimentary Rocks
  • Grain size of rocks depends on how fast the water was moving.
  • If water is moving fast, then it carries smaller grains downstream and deposits larger grains.
sedimentary rocks2
Sedimentary Rocks
  • Grain size of rocks depends on how fast the water was moving.
  • If water is moving slowly, then it deposits the smaller grains.
sedimentary rocks3
Sedimentary Rocks
  • In oceans, critters create shells, skeletons, and cell walls that, when deposited, form various types of limestone.
metamorphic rocks
Metamorphic Rocks
  • Formed when pre-existing rocks are changed into new rocks because of an increase in temperature or pressure as the rocks are buried.
metamorphic rocks1
Metamorphic Rocks
  • At very high T & P (deep within the Earth), the rocks become color banded. These rocks were formed deep beneath a mountain.