Difference between revisions of "Earth's crust"
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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. | 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. | ||
| − | 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> | + | 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 beleive the Bible discredits the notion that the Earth is billions of years old. |
==References== | ==References== | ||
<references/> | <references/> | ||
Revision as of 22:08, March 13, 2007
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.
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.[1] Many beleive the Bible discredits the notion that the Earth is billions of years old.
References
- ↑ EarthScope: The Oldest Crust on Earth