Chemical Composition - Chemical Composition
Chemical Composition (1) Add new question
Question
Q: what is the chemical composition of the earth?
| Option | Answer | Is Correct |
|---|---|---|
| 1 | The mass of the Earth is approximately 5.93x 1024 kg. It is composed mostly of iron (32.1%), oxygen (30.1%). silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (I .5%). and aluminum (1 .4%): with the remaining I .2% consisting of trace amounts of other elements. Due to mass segregation, the core region is believed to be primarily composed of iron (88.8%). with smaller amounts of nickel (5.8%), sulfur (4.5%), and less than 1% trace elements. The geo chemist F. W. Clarke calculated that a little more than 47% of the Earth’s crust consists of c,oxygen. The more common rock constituents of the Earth’s crust are nearly all oxides; chlorine, sulfur and fluorine are the only important exceptions to this and their total amount in any rock is usually much less than 1%. The principal oxides are silica, alumina, iron oxides, lime, magnesia. potash and soda. The silica functions principally as an acid, forming silicates, and all the commonest minerals of igneous rocks are of this nature. From a computation based on 1,672 analysis of all kinds of jocks, Clarke deduced that 99.22% were composed of 11 oxides. All the other constituents occur only in very small quantities. |
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