Why is oceanic crust thinner than continental crust?

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SUMMARY

Oceanic crust is significantly thinner than continental crust due to differences in composition, age, and formation mechanisms. The oceanic crust is primarily composed of basalt, while continental crust consists mainly of granite, contributing to its greater thickness. Additionally, oceanic crust is younger, continuously formed at mid-ocean ridges, whereas continental crust can be billions of years old. Understanding these differences is crucial for geophysics studies.

PREREQUISITES
  • Basic understanding of geology and crustal composition
  • Knowledge of plate tectonics and crust formation processes
  • Familiarity with the differences between basalt and granite
  • Awareness of geological time scales and crustal age
NEXT STEPS
  • Research the composition of oceanic and continental crust
  • Study the processes of crust formation at mid-ocean ridges
  • Explore the geological time scales relevant to crustal development
  • Investigate the implications of crust thickness on tectonic activity
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Geophysics students, geology enthusiasts, and professionals in earth sciences seeking to understand the fundamental differences between oceanic and continental crust.

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Hi, I am doing a geophysics assignment and had some confusion. Basically I want to know why oceanic crust is so much thinner than continental crust. My friend has told me it's because there is less weight on top of it because the ocean water is not very dense, causing the mantle to rise up higher in that area. Doesn't seem right to me. Can someone please clarify?
 
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SeannyBoi71 said:
Hi, I am doing a geophysics assignment and had some confusion. Basically I want to know why oceanic crust is so much thinner than continental crust. My friend has told me it's because there is less weight on top of it because the ocean water is not very dense, causing the mantle to rise up higher in that area. Doesn't seem right to me. Can someone please clarify?
Your friend is wrong. What does your textbook say about the crust? What research have you done and what have you found?

I just googled it and got the answers in less than .05 seconds. Try doing a search and if you still have specific questions, please ask. It's always good to look first yourself.
 
Last edited:
Questions you might wish to ask yourself would include:
how do the compositions of oceanic and continental crust differ
how do the ages of the two differ
how do the formation mechanisms of the two differ
what does my forum name mean
 
Evo said:
... I just googled it and got the answers in less than .05 seconds ...

Oh, Evo, there you go again expecting people to actually do at least some trivial amount of research THEMSELVES before asking questions here. SUCH high expectations for today's youth.
 

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