Correct Option
The correct option isStalagmite and stalactite caves.
Explanation
Mawsynram, located in the East Khasi Hills district of Meghalaya, is globally recognized as the wettest place on Earth due to the funnel-shaped orography of the hills that traps moisture-laden winds. Geologically, the region is characterized by limestone formations. The interaction between the intense precipitation and the limestone bedrock leads to the development of significant Karst topography.
Option Analysis
- Stalagmite and stalactite caves.: Correct. The Mawsynram region is famous for its limestone caves, such as the Mawjymbuin Cave. These caves are formed through the chemical weathering of limestone by water (carbonation), resulting in depositional features like stalagmites (growing from the floor) and stalactites (hanging from the roof).
- Sand dunes.: Incorrect. Sand dunes are depositional landforms typically found in arid or semi-arid desert regions (aeolian landforms), not in high-rainfall zones like Meghalaya.
- Glaciers.: Incorrect. Glaciers are persistent bodies of dense ice found in high-latitude or high-altitude regions (cryosphere). Mawsynram has a subtropical highland climate and does not support glaciation.
- Coral reefs.: Incorrect. Coral reefs are marine ecosystems formed by calcium carbonate structures secreted by corals, found in warm, shallow ocean waters, not in inland hill stations.
Key Takeaway
While Mawsynram is primarily defined by its record-breaking orographic rainfall, this precipitation acts as a geomorphic agent on the local limestone geology to create extensive stalactite and stalagmite caves.