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Chemistry Q - Plate Tectonics watch

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    Hello
    I was revising thru my GCSE CGP Chem book and I noticed they said that oceanic plates are less dense than continental plates which is why they go under the latter. Yet in my Collins Total Rev book it says oceanics are DENSER.

    I would agree with Collins Total Rev, but I'm not really sure. Which book is right?
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    Oceanic plates are denser due to the high pressure of the water. This is why they go under continetal plates - less dense materials float above more dense ones.
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    Have to be a bit more sceptical of what those CGP guides say now!

    Thanks
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    (Original post by Golden Maverick)
    Oceanic plates are denser due to the high pressure of the water. This is why they go under continetal plates - less dense materials float above more dense ones.
    Oceanic plates are predominantly composed of Silica and Magnesium and have an average density of 3.0 whereas Continental plates are composed of Silica and Aluminium with an average density of 2.6. I really don't think it has much to do with the pressure of the water!
 
 
 

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