Earth's crust

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The Earth's crust is the geological outer layer of the Earth. There are two types of crust: continental and oceanic.

Continental crust is made up of less dense materials than oceanic crust and is generally much thicker (generally 25–75 km thick as opposed to oceanic 6 km). The thickest crust is found underneath the Himalayan mountain chain where the roots of the mountains extend to around 75 km.[1]

Continental crust is also much older than oceanic. The oldest crust in existence today is found in Australia and has an apparent age of 4.4 billion years.[2] Many believe that the Bible discredits the notion that the Earth is billions of years old.


  1. USGS: Earth's Crust
  2. EarthScope: The Oldest Crust on Earth