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Partly by analogy to what is known about the Moon, Earth is considered to have differentiated from an aggregate of planetesimals into its core, mantle and crust within about million years of the formation of the planet, 4. The continental crust is typically from 30 km 20 mi to 50 km 30 mi silicone and is mostly composed of slightly less dense rocks than those of silicone oceanic crust. A theoretical protoplanet named "Theia" is thought to have collided with the forming Earth, and part of the material ejected into space by the collision accreted to form the Moon. Hareketli ortalamalar forex n kesimesi bu anlamda bir sinyal olarak kabul edilir. Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic helen. The crust is underlain by the mantle.