Geography · Oceanography
The morphology of a slow-spreading mid-oceanic ridge axis (such as the Mid-Atlantic Ridge) is characterized by:
- 1absence of an axial valley, active thrust faults, and continuous shield volcanoes
- 2an axial rift with depth not exceeding 100–200 m, having en-echelon faults and continuous central volcanoes
- 3an axial graben with 50–100 m depth, thrust faults, and discrete central volcanoes
- 4an axial graben with 1500–3000 m depth, faulted topography, and intermittent volcanoes✓
Correct answer
an axial graben with 1500–3000 m depth, faulted topography, and intermittent volcanoes
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