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Question
The transformation of rocks into metamorphic rocks takes place as a result of intense heat and pressure. Given below are the types of metamorphism and the processes involved. Which one is incorrect?
Options
Thermal Metamorphism : high temperature.
Dynamic Metamorphism : pressure at great depths in the crust.
Regional Metamorphism : large scale earth movement.
Contact Metamorphism : high pressure below the ocean bed.
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Solution
Contact Metamorphism : high pressure below ocean bed
Explanation:
Contact metamorphism occurs when existing rocks are transformed primarily by high temperature due to their proximity to molten magma or lava intrusions, not by high pressure below the ocean bed. The heat from the nearby magma “bakes” the surrounding rock, causing mineral changes. In contrast, high pressure at great depths is associated with dynamic or regional metamorphism, which involves large-scale pressure and movement within the Earth’s crust. Therefore, describing contact metamorphism as caused by high pressure below the ocean bed is incorrect.
