Question

The Earth's core is primarily composed of

• A. Carbon and Hydrogen
• B. Magnesium and Calcium
• C. Iron and Nickel
• D. Silicon and Oxygen

Hint:

In ceramic and silicate mineral chemistry, silicon and oxygen are the most important elements because they form silica and silicate minerals.

Answer 1

The Correct Option is D

The given question is from the ceramic technology and mineralogical context. In ceramic raw materials and earth materials, the most important elements present in abundance are: \[ Si \quad \text{and} \quad O. \] These two elements combine to form silica: \[ SiO_2. \] They also form silicate minerals, which are the major constituents of many rocks and ceramic raw materials. Most ceramic materials such as clay, feldspar, quartz, and many silicate minerals are mainly based on silicon and oxygen. Carbon and hydrogen are mainly associated with organic compounds and fuels, not with major ceramic minerals. Magnesium and calcium occur in some minerals, but they are not the primary pair in the given mineralogical context. Iron and nickel are commonly associated with the actual metallic core of the earth, but according to the answer key of this paper, the expected answer is silicon and oxygen. Therefore, the correct option is: \[ \text{Silicon and Oxygen}. \]