| IV. Translate the following text into your native language:
Silicon is one of the most abundant elements found in the earth’s crust. It is second to oxygen in abundance.
Silicon never occurs free, but in combination with oxygen or with oxygen and metals. It forms a great variety of organic and in organic compounds. Elementary silicon is used as an alloying constituent to strengthen aluminum, copper, magnesium and other metals. It has a deoxidizing effect on steel.
Silica is a crystalline form of silicon dioxide.
Silica bricks, made of nearly pure silica are extensively used in metallurgical industry. Silica is also used as one of the raw materials for the manufacture of common glass.
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