Question

Which combination of the following elements constitute a major portion of earth crust.?

Answer 1

Answer:

Explanation:

Iron , oxygen , silicon and magnesium elements constitutes a major portion of earth crust. These elements occupies more than 90./. Of earths mass....

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Answer 2

Oxygen, Silicon, Aluminium, iron etc. are some of the followings that constitute a major portion of earth's crust.

Explanation:

Oxygen is the most abundunt element which contribute about 46.6 % of total earth crust. oxygen is present in many forms like in disolved form in water for sustaining of aquatic life. In ores, it is in compound form like sulpher dioxide etc.

Silicon is the second most abundunt element in earth's crust which contributes around 27.7 %. They are extracted from ores which are present in the earth crust. An example of ore is Quartz which is Sillica (Sillicon dioxide).

Alluminium is the third most abundant element of eatrh crust which contributes about 8.1 % of the total earth crust. Major ore of Aluminium is Bauxite. It is used in construction work, in window covering as it is very ligjt weight with sufficient strength.

Iron is the forth abundant element of earth crust as it is present around5 % of total earth crust. Iron can be extracted in many forms like in pig iron, cast iron, white cast iron, wrought iron. It is used in steel also for its hardness.