How are ocean trenches formed? Describe the significant characteristics of these oceanic relief formations. (Answer in 150words)
Introduction
Ocean trenches are valleys formed at border of continental plate. These are the lowest points of ocean relief. (Eg Mariana Trench formation)
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Main Body
Formed due to convergence between continental oceanic plate at convergent area -> Oceania plate due to heavy density, subduct under continental plate and form trenches.
eg. Java trench in Indian ocean.
Characteristics of these relief formations:
(Eg Ring of fire in pacific ocean.)
Thus, oceanic trenches play vital role in tectonic plate theory as proposed by Mckenzie.
Conclusion
Thus, oceanic trenches play vital role in tectonic plate theory as proposed by McKenzie.
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Diagram
Diagram showing trench formation: convergent plate boundary with continental plate and oceanic plate, showing subduction of oceanic plate under continental plate, and formation of trench
- Clear definition of ocean trenches
- Explains mechanism of formation (convergence and subduction)
- References plate tectonic theory
- Provides specific examples
- Identifies trenches as lowest oceanic points
Mansi Singh
Salient features of World's Physical Geography
Oceanic relief and plate tectonics
Ocean trench formation
149
Total words
8
Paragraphs
analytical, geological
Tone