Difference between revisions of "Earth's crust"
Damosuzuki (Talk | contribs) |
m (A few sources wouldn't hurt. Also fixed two minor mistakes) |
||
| Line 1: | Line 1: | ||
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. | + | 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 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 | + | 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>, although many would argue that Hovis loaves have much older crusts.{{fact}} Many believe the Bible discredits the notion that the Earth is billions of years old.{{fact}} |
==References== | ==References== | ||
<references/> | <references/> | ||
Revision as of 14:38, March 16, 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.[Citation Needed]
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], although many would argue that Hovis loaves have much older crusts.[Citation Needed] Many believe the Bible discredits the notion that the Earth is billions of years old.[Citation Needed]
References
- ↑ EarthScope: The Oldest Crust on Earth
