C. Give short answers for the following questions.
1. What are the main characteristics of minerals?
2. How did minerals influence the history of human civilization?
3. Why is petroleum called 'black gold?
4. How can we conserve minerals and power resources?
Answers
Answer:
(1) Most minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, an
d tenacity.
(2) Ans: Minerals have played an important role in the history of human civilization. Thus, various stages of human development have been named after different minerals, such as: Stone Age, Copper Age, Bronze Age, Iron Age, Steel Age, etc. ... Growth of
oil, it gives golden colour.
(3)The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour. Petroleum is very expensive like gold. ... But after the purification of black crude oil, it gives golden colour
- (4) Measures to conserve minerals resources are as follows: Use of minerals in a planned and sustainable manner, recycling of metals. Use of alternative renewable substitutes. Improvising the technology so that low-grade ores can be used profitably.
Answer:
1. The main characteristics of minerals are color, streak, hardness, luster, diaphaneity, specific gravity, cleavage, fracture, magnetism and solubility.
2. Minerals influenced the history of human civilization by being named to different stages of human history e.g., Stone age, copper age, iron age, etc.
3. Petroleum is called 'black gold' because it's colour is black and its cost is very expensive in the market like gold.
4. We can conserve minerals in following ways.
- low usage of minerals
- recycling of metals
- finding alternative for minerals
Explanation:
Hope it helps you.
Good Evening.