What is the Composition of crust.

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jerichorayel's profile pic

jerichorayel | College Teacher | (Level 2) Senior Educator

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Crust in geology is defined as the outermost solid surface of a planet or other celestial body in the universe. To compare, the Earth's crust is like the skin of an apple. Meaning, it is so thin compared with the other parts of the Earth.

The Earth's crust is generally consisting of compounds from the elements like oxygen, silicon, aluminum and some of the IA and IIA metals. The rocks are made up of silicates and oxides which are formed in different manner. Silicates are abundant in all the types of rocks that are present in the crust. 

Here are the list of first 10 abundant elements in the crust.  (Source: Wikipedia)

  • Oxygen
  • silicon
  • aluminium
  • iron
  • calcium
  • sodium
  • potassium
  • magnesium
  • titanium
  • hydrogen

Another list of oxides found in the Earth's crust (Source: Wikipedia)

  • SiO2           60.6%
  • Al2O3         15.9%
  • CaO            6.4%
  • MgO            4.7%
  • Na2O           3.1%
  • Fe as FeO    6.7%
  • K2O            1.8%
  • TiO2            0.7%
  • P2O5           0.1%

 

Sources:
zorkin's profile pic

zorkin | Student, Grade 10 | eNotes Newbie

Posted on

Component

Symbol                               

Oxygen                                                                          Volume

O
46.6%

Silicon

Si
27.8%

Aluminum

Al
8.1%

Iron

Fe
5.0%

Calcium

Ca
3.6%

Sodium

Na
2.8%

Potassium

K
2.6%

Magnesium

Mg
2.0%

others

 
1.6%
 

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