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

The 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 25-75km thick as opposed to oceanic 6km). The thickest crust is found underneath the Himalayan mountain chain where the roots of the mountains extend to around 75km.{{fact}}

Continental crust is made up of less dense materials than oceanic crust and is generally much thicker (generally 25-75km thick as opposed to oceanic 6km). The thickest crust is found underneath the Himalayan mountain chain where the roots of the mountains extend to around 75km.<ref>USGS: [http://earthquake.usgs.gov/research/structure/crust/index.php Earth's Crust]</ref>

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<ref>EarthScope: [http://www.gps.caltech.edu/~enadin/Writing/ES_OldestCrust.pdf The Oldest Crust on Earth]</ref>. Many believe the Bible discredits the notion that the Earth is billions of years old.{{fact}}

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<ref>EarthScope: [http://www.gps.caltech.edu/~enadin/Writing/ES_OldestCrust.pdf The Oldest Crust on Earth]</ref>. Many believe the Bible discredits the notion that the Earth is billions of years old.{{fact}}