Question

In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earths surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. Are obtained from veins and lodes.

Answer 1

7 How do minerals occur in igneous and metamorphic rocks?

Ans. Minerals generally occur in these forms: In igneous and metamorphic rocks, minerals may occur in the cracks, crevices, faults and joints. The smaller occurrences are called veins and the larger one are called the Iodes. In most of the cases, they are formed when minerals in liquid/molten and gaseous forms are forced upwards through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.

Q. 8. How do minerals occur in sedimentary rocks?

Ans. 
i). In sedimentary rocks, a number of minerals occur in beds or layers.
ii). They have been formed as a result of deposition, accumulation and concentration in horizontal stratas.
iii). Coal and some forms of iron ore have been concentration as a result of long periods under great heat and pressure.
iv) .Another group of sedimentary minerals include gypsum, potash, salt and sodium salt. These are formed as a result of evaporation especially in arid regions.

Q. 9.  What are the uses of aluminum?

Ans
i). It is used for making pots and pans because it a good conductor of heat.
ii). Aluminum also conducts electricity well and is used to make electrical wires. Aluminum is used to make cans and various beverages and other liquids.
iii). It can be pressed into a thin foil that is used both commercially and in homes for such purposes as wrapping foods for storage.
iv). Because, aluminum is light and strong, it is widely used in aeroplanes and spacecrafts. It can be made even stronger by mixing it with other metals to form same important alloys.

Q. 10. Explain the formation of petroleum in India?

Ans. Most of the petroleum occurrence in India are associated with anticlines and fault traps in the rock formation of the Tertiary age. In regions of the folding, anticlines or domes, it occurs were oil is trapped in the crest of the unfold. The oil bearing layer is a porous limestone or sandstone through which oil may flow. The foil is prevented from rising or sinking by the intervening non-porous layers.
Petroleum is also found in the fault traps between the porous and the non-porous rocks. Gas being lighter usually occurs above the oil.


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Answer 2

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