Geography · Geomorphology and Volcanism
Which of the following statements best reflects the Mantle Plume Hypothesis and its implications in explaining intraplate volcanism and hotspot tracks, in contrast to plate boundary processes?
- 1Mantle plumes explain the episodic movement of tectonic plates by generating subduction zones, but cannot account for surface volcanic activity due to their low thermal energy.
- 2Mantle plumes are deep-seated thermal anomalies, possibly rising from the core-mantle boundary, causing hotspot volcanism like the Hawaiian chain, independent of plate margins.✓
- 3Mantle plumes originate from the asthenosphere, are stationary with respect to tectonic plates, and are responsible for features like the Mid-Atlantic Ridge and Mariana Trench.
- 4Mantle plumes are narrow, buoyant columns of cold material rising from the upper mantle, forming island arcs and rift valleys primarily at divergent plate boundaries.
Correct answer
Mantle plumes are deep-seated thermal anomalies, possibly rising from the core-mantle boundary, causing hotspot volcanism like the Hawaiian chain, independent of plate margins.
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