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How Does Magma Affect Land Features?. D35. Underground magma can cool and harden in many shapes and forms before it reaches the surface. Dike: hardens in vertical cracks Sill: hardens between horizontal layers of rock (flat)

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Dike: hardens in vertical cracks
  • Sill: hardens between horizontal layers of rock (flat)
  • Laccolith: Magma pushes into a sill to form a pocket, pushes rock layers up into dome mountains.
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Dome mountains:broad, circular mountains formed from uplifted rock layers (Black Hills of South Dakota)
  • Batholiths: largest and deepest underground formation- if above sea level it looks like large steep hills