The correct option is Iceland.
Explanation
Mid-Oceanic Ridges (MORs) are continuous underwater mountain chains formed by plate tectonics, specifically at divergent plate boundaries where magma rises to create new crust. While the vast majority of these ridge systems remain submerged deep within the ocean, certain peaks or sections rise above sea level to form islands due to significant volcanic activity or the interaction with geological hotspots.
Option Analysis
- Hawaii Hawaii: Incorrect. The Hawaiian Islands are volcanic islands formed by a hotspot located in the middle of the Pacific Plate, far from any plate boundary or mid-oceanic ridge.
- Iceland Iceland: Correct. Iceland is situated directly on the Mid-Atlantic Ridge, which is the divergent boundary between the North American and Eurasian tectonic plates. It is the most prominent example of a mid-oceanic ridge rising above the ocean surface.
- Sri Lanka Sri Lanka: Incorrect. Sri Lanka is a continental island situated on the continental shelf of Asia. It is geologically linked to the Indian subcontinent and is not formed by mid-oceanic ridge volcanism.
- Madagascar Madagascar: Incorrect. Madagascar is a continental fragment that split from the supercontinent Gondwana. It is not a volcanic island formed by a mid-oceanic ridge.
Key Takeaway: Iceland represents a unique geological feature where the Mid-Atlantic Ridge is exposed above sea level, allowing for the direct observation of divergent plate boundary processes on land.