The sun moon and other planets are spheres. Pine trees are cones. Tornadoes are upside down cones. The trunks of some trees and the stems of some plants are cylinders.
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starfish
The sun and the moon are spheres... and maybe mountains are cones?
Algebraic is non-geometric.
A geometric solid. The answer is NOT polyhedron. A cone, for example, which is a figure made up of the most simple geometric shapes (a straight line) and a circle, is not a polyhedron.
Crystals.