Difference between revisions of "Earth's crust"
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| − | The crust is the geological outer layer of the Earth. There are two types of crust: continental and oceanic. | + | 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 25-75km 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 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. | + | 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 that the [[Bible]] discredits the notion that the Earth is billions of years old. |
==References== | ==References== | ||
<references/> | <references/> | ||
| + | [[Category:Geology]] | ||
Revision as of 15:12, February 14, 2009
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 25-75km 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.[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.
References
- ↑ USGS: Earth's Crust
- ↑ EarthScope: The Oldest Crust on Earth