why continental crust has more thickness but less density? reasons

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The continental crust consists of a layer of metamorphic, igneous and sedimentary rock. It contains felsic or granitic rock. The oceanic crust, mainly contains mafic or basaltic rock. This dark colored rock is rich in iron and...

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monakhan | Student
There are two main reasons: 1)The compositon of continetal crust is such that it has more thickness but the density is less. 2)The pressure inside the continental crust is high due to presence of water vapours.Actually it is the high pressure of water vapours due to which the density decreases and thickness increases.