Submarine Reliefs — Chapter Summary
ICSE · Class 11 · Geography
Summary of Submarine Reliefs for ICSE Class 11 Geography. Key concepts: A slightly inclined, The steep seaward slope at and A gentle slope beyond.
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Overview
The ocean floor is rugged and varied, not flat. Its relief is shaped by tectonic, volcanic, erosional, and depositional processes. The major parts of the ocean floor are the continental shelf, continental slope, continental rise, and abyssal plain. Other important features include submarine ridges,
Key Concepts
A slightly inclined
A slightly inclined, inundated zone forming the border of a continent. Its slope is less than 1°, its maximum depth is normally 200 metres, and it cov
The steep seaward slope at
The steep seaward slope at the edge of the continental shelf. Its angle varies between 2° and 5°, and it extends to about 3,660 metres depth. Continen
A gentle slope beyond the continental
A gentle slope beyond the continental slope, with an angle of 0.5° to 1°. It becomes flat with increasing depth and merges with the abyssal plain.
A deep
A deep-sea plain beginning where the continental rise ends. It has a gradient of less than 1°, a depth of 3,000 to 6,000 metres, and covers about 40%
These are underwater mountain ranges
These are underwater mountain ranges a few hundred kilometres wide and several thousand kilometres long. They are mostly of tectonic origin and form t
Learning Objectives
- Understand the main divisions of the ocean floor.
- Describe the size, shape, depth, and importance of the continental shelf, slope, rise, and abyssal plain.
- Identify submarine ridges, seamounts, guyots, trenches, and canyons and explain their origin.
- Compare the floors of the Pacific, Atlantic, and Indian Oceans.
- Recognize major examples such as the Mariana Trench, Mid-Atlantic Ridge, Hudson Canyon, and Sunda Trench.
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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