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Rock Characteristics
  • low compressibility
  • larger size
  • Porosity - 2 -3%
  • Generally Grains are cemented
  • Joints, Fractures, Folds
Soil Characteristics
  • Sand, Gravel - low compressibility
  • Silt, Clay - high compressibility
  • Porosity 30-40%
  • Rarely grains are cemented
Igneous Rocks
  • The cooling process of magma into rock
  • Intrusive - magma cools slowly
  • extrusive - magma cools quickly
Basalt
  • Type of Igneous - Extrusion
  • Fine Grained
  • very hard
  • used for road construction
Grainite
  • Intrusive Igneous Rock
  • Coarse Grained
  • Not as hard as basalt but still good construction material
Sedimentary Rock
  • Soil Deposits are transformed back into rock through the hardening process called lithification
Shale
Limestone
SandStone
  • made of silt and clay, or sand and clay
  • Contains mainly clay, has impurities
Metamophic Rock
  • Result of heat and pressure deep down in earths core
Foliated Metamorphic Rock
  • Slate
  • Schist
  • Very soft
Nonfoliated Metamorphic Rock
  • Marble
  • Quartz
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