What is the average thickness of continental crust

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Lithos 33 1—3 — Roberta L. Rudnick 1 2 Email author 1. All three major rock types—igneous, metamorphic, and sedimentary—are found in the crust. Continental crust is less dense because of its composition. Continental crust is made up of felsic material SiO4 — mainly granite.

The density of continental crust is 2. Oceanic crust, while thinner, is made of mafic materials Fe, Mg — mainly basalt. The average density of oceanic crust is 3. The plate is either of general polygonal shape or of circular shape. Unlike the mineral-rich crust and mantle, the core is made almost entirely of metal—specifically, iron and nickel. Elements that dissolve in iron, called siderophiles, are also found in the core.

The core is thought to be so hot due to the decay of radioactive elements, leftover heat from planetary formation, and heat released as the liquid outer core solidifies near its boundary with the inner core. This means rocks, topsoil, trees, buildings, your pet dog, and so on, would be swept away into the atmosphere.

The solid inner core turns only once every years or so, relative to the rest of the planet. No one knows the real reason for field reversals. Skip to content Natural sciences. What is the approximate thickness of a continental crust?