kettle
kettle
* cone * pyramid
I think is a prism. it is because it has no sharp points.
The description given could be applicable to a pyramid
horn
Glacial horn
CONE
kettle
The sharp pyramid-shaped peak formed by the erosion of three or more cirques on a mountain is called a horn. This landform is typically created by the intersection of multiple glaciers eroding the mountain from different sides, resulting in steep, jagged peaks. Famous examples include the Matterhorn in the Swiss Alps.
Sharp pyramid-shaped peaks formed by alpine glaciers are called horn glaciers. Horn glaciers are created when three or more cirque glaciers erode a mountain from different sides, leaving behind a sharp-edged peak. Famous examples include the Matterhorn in the Alps.
Glacial horn
Glacial horn
kettle
terminal moraines--------------------------------------------------------------------------------------------------------They can be:Cirques, bowl-shaped depressions where glacial ice cuts back into the mountain walls.Horns, sharp, pyramid-like peaks that form when three or more alpine glaciers carve a mountain.Arête, a jagged ridges that form between two or more cirques that cut into the same mountain.Also U-shaped valleys and Hanging Valleys.
Helicopters propellers are not 'sharp' . They are aero-dynamically shaped.
* cone * pyramid