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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
deformation
CONE
Glacial horn
kettle
horns
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