Geology: Rocks and Their Types

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Questions and Answers

What is the term for rock formed when molten rock solidifies?

  • Metamorphic rock
  • Clastic sedimentary rock
  • Bioclastic sedimentary rock
  • Igneous rock (correct)

Which term describes the breakdown of rock into smaller pieces?

  • Precipitation
  • Weathering (correct)
  • Texture
  • Foliation

What is the term for the arrangement of minerals in a rock, describing their size and shape?

  • Metamorphic grade
  • Magma
  • Carbonate rock
  • Texture (correct)

Which type of rock is formed from the remains of living organisms?

<p>Bioclastic sedimentary rock (C)</p> Signup and view all the answers

What does the term 'foliation' refer to in geology?

<p>Parallel layering of minerals in a rock (C)</p> Signup and view all the answers

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Study Notes

Igneous Rocks

  • Igneous rocks are formed when molten rock solidifies.
  • Extrusive igneous rocks are formed when lava cools.

Sedimentary Rocks

  • Clastic sedimentary rocks are made from fragments of weathered rocks.
  • Bioclastic sedimentary rocks are formed from the remains of living organisms.
  • Carbonate rocks are a type of bioclastic rock with high amounts of calcite and/or dolomite.

Metamorphic Rocks

  • Metamorphic grade measures the intensity of change in a rock due to heat, pressure, or chemical conditions.
  • Foliation is the parallel layering of minerals in a rock, often a result of metamorphic processes.

Other Key Terms

  • Weathering is the breakdown of rock into smaller pieces.
  • Precipitation is the formation of a solid from ions previously dissolved in a liquid.
  • Texture describes the size, shape, and arrangement of minerals in a rock.
  • Magma is liquid rock found beneath the Earth's surface.

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