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What is earths crust made of?

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They will vary depending on the way they were calculated and the source. 98.4% of the Earth's crust consists of oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. All other elements account for approximately 1.6% of the volume of the Earth's crust. read more

Oceanic crust, being so thin, is a very small fraction of the Earth -- about 0.1 percent -- but its life cycle serves to separate the contents of the upper mantle into a heavy residue and a lighter set of basaltic rocks. read more

The structure of the Earth is like an onion; it has multiple layers. Earth's layers consist of the crust, mantle and core. Several elements make up the composition of Earth. read more

Earth's mantle, is made up of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals.Crust is made up of mostly oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium and generally is called as SIMA( silica and magnesium ). read more

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