V. Answer the following questions in detall,
1. What is the difference between surface mining, underground mining and alluvial mining?
2. How are coal and petroleum formed?
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Explanation:
Answer 1) Surface mining can be done on the surface, such as mountain top, beaches. ... Underground mining is used for small, high-grade deposits covered with a thick soil or rock above the ore. Alluvial mining is suitable for deposits in sand and riverbeds. surface mining is commonly used to extract coal and copper.
Answer 2) Coal and petroleum are formed as a result of degradation of ancient plant life which lived millions of years ago. These dead plant matter started to pile up, eventually forming a substance called peat. Over time, heat and pressure from geological processes transformed these materials into coal.
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