Igneous Rock Features

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Igneous Rock Features
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Batholith

• Hardened magma chamber
• Can be 100s of kilometers wide, long and thick

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Laccolith

• Magma that came up through the crust and
  hardened, but never broke through and never
  became a volcano.
• Pushes up layers of rock
• Smaller than a batholith

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Dike

• Magma squeezes into vertical cracks that cut
  across rock layers

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Sill

• Magma squeezes into horizontal cracks between
  rock layers

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Volcanic neck

• A volcano stops erupting and the magma hardens
  inside the vent.
• Erosion wears away the sides of the volcano and
  leaves the solid center

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Caldera

• Large opening formed when the top of a volcano
  collapses down into the partially emptied magma
  chamber

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Volcanic Bombs, Easter Island
Devils Postpile, CA
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Giants Causeway, Ireland