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Minerals & their Mode Of Occurrence Video Lecture | Geography for Grade 10
FAQs on Minerals & their Mode Of Occurrence Video Lecture - Geography for Grade 10
| 1. What are minerals and how do they occur? |  |
Ans. Minerals are naturally occurring substances that have a definite chemical composition and a crystalline structure. They are formed through various geological processes such as cooling of magma, precipitation from solution, and deposition from evaporation. Some minerals also occur as a result of metamorphism, which involves changes in temperature and pressure within the Earth's crust.
| 2. What are the different modes of occurrence of minerals? | |
Ans. Minerals occur in various modes depending on the geological processes that form them. The common modes of occurrence include veins and lodes, where minerals are deposited in cracks and fissures of rocks. Minerals can also occur as sedimentary deposits, formed through the accumulation and cementation of sediments. Additionally, minerals may be found in igneous rocks as crystals or as mineralized zones in metamorphic rocks.
| 3. How are minerals formed in veins and lodes? | |
Ans. Minerals are formed in veins and lodes when mineral-rich fluids circulate through fractures in rocks and deposit minerals in the cracks. These fluids, often associated with magmatic or hydrothermal processes, carry dissolved minerals and deposit them as they cool and undergo pressure changes. Over time, the minerals accumulate and form veins or lodes within the surrounding rock.
| 4. What are sedimentary deposits of minerals and how are they formed? | |
Ans. Sedimentary deposits of minerals are formed through the accumulation and subsequent cementation of sediments. Weathering and erosion of rocks release small mineral particles, which are transported by wind, water, or ice and eventually settle in basins or depressions. Over time, these sediments are compacted and cemented together, forming sedimentary rocks that may contain minerals.
| 5. How do minerals occur in igneous rocks? | |
Ans. Minerals can occur in igneous rocks as crystals that crystallize from cooling magma. When magma cools and solidifies, the mineral constituents arrange themselves into an ordered crystalline structure. The size and composition of the crystals depend on the cooling rate and the chemical composition of the magma. Igneous rocks can contain a variety of minerals, including quartz, feldspar, and mica, among others.
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