Oceanic crust

From Bharatpedia, an open encyclopedia
Age of oceanic crust

The oceanic crust is the part of Earth's lithosphere that is under the ocean basins.

Oceanic crust is primarily composed of mafic rocks, or sima which is named for its magnesium silicate minerals. It is thinner than continental crust, and is about 7-10 kilometers thick, however it is more dense, having a mean density of about 3.3 g/cm3.

Oceanic crust generally does not last longer than 200 million years. In the rock cycle, it is continuously created at oceanic ridges. At these ridges, hot magma rises into the crust and cools, pushing the crust apart at the ridge. The continuous formation of new oceanic crust pushes the older crust away from the mid-ocean ridge. As it moves away from the ridge, the crust becomes cooler and denser, while the sediment may build on top of it.

See also[edit]



  • Marshak, Stephen. (2005) Earth: Portrait of a Planet (41-87)

External links[edit]

Information red.svg
Scan the QR code to donate via UPI
Dear reader, We kindly request your support in maintaining the independence of Bharatpedia. As a non-profit organization, we rely heavily on small donations to sustain our operations and provide free access to reliable information to the world. We would greatly appreciate it if you could take a moment to consider donating to our cause, as it would greatly aid us in our mission. Your contribution would demonstrate the importance of reliable and trustworthy knowledge to you and the world. Thank you.

Please select an option below or scan the QR code to donate
₹150 ₹500 ₹1,000 ₹2,000 ₹5,000 ₹10,000 Other