igneous rocks n.
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Igneous rocks. Magma. You cannot have igneous rocks without the production of Magma Magma is really just molten rock (either sedimentary or metamorphic) because of the intense heat and pressure within the Earth

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magma
Magma
  • You cannot have igneous rocks without the production of

Magma

Magma is really just molten rock (either sedimentary or metamorphic) because of the intense heat and pressure within the Earth

Magma is less dense than the surrounding rock so it is pushed upward and can be released from a volcano

Underground-magma

Above ground- lava

intrusive igneous rocks
Intrusive igneous rocks
  • Formed below ground
  • Only reach the surface when erosion moves the soil from the underground rock or uplifting has occurred
  • Requires a long time for the magma to cool so mineral grains are large and can be viewed with the unaided eye
extrusive igneous rocks
Extrusive igneous rocks
  • Formed above ground
  • Magma cools rapidly
  • Mineral grains are small and fine grained
slide6

Basalt

Pumice

Obsidian

Extrusive Igneous Rocks