The correct option is 1, 2 and 3.
Explanation
Glacial horns, also known as pyramidal peaks, are sharp, steep-sided mountain peaks formed by glacial erosion. They represent an advanced stage of cirque development where glaciers erode a mountain summit from multiple sides.
Statement-wise Analysis
- Statement 1 is Correct: Glacial horns are formed through the headward erosion of cirque walls. When three or more radiating glaciers cut backward into a single mountain mass, the cirques converge, sharpening the summit into a pointed peak.
- Statement 2 is Correct: As the cirques recede and meet, the remaining rock mass becomes a high, sharp-pointed, and steep-sided peak. The dividing walls between the cirques (arêtes) become narrower and sharper, contributing to the pyramidal shape of the horn.
- Statement 3 is Correct: Mount Everest in the Himalayas is a prominent example of a glacial horn. Other famous examples include the Matterhorn in the Alps. These peaks exhibit the characteristic pyramidal structure resulting from intense glacial scouring on multiple faces.
Key Takeaway
Glacial Horns are erosional landforms created when three or more cirques erode headward into a central mountain peak, resulting in a sharp, pyramidal summit.