Question
State two factors that determine the mode of occurrence of minerals.
Answer
- Vulcanicity / cooling and solidification of magma in cracks / deposition due to evaporation by hot water from hot springs & geysers.
- Metamorphism / High pressure & heat causing recrystallization / hot magma intruding into the rocks cause recrystallization.
- Sedimentation / accumulation of minerals during the formation of sedimentary rocks/ formation of coral limestone / formation of coal seams after being buried in extensive swamps.
- Evaporation in arid and semi-arid areas leading to high concentration of mineral salts.
- Weathering where rocks are deeply weathered chemically to form bauxite, nickel, manganese.
- Erosion dislodges mineral particles which are later deposited as alluvium on river and lake beds.
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