It is called the cupping of the bat, used for weighting.
If you are talking about the large crater created after a volcano errupts, then it would be a caldera. They are formed after the magma chamber is emptied, when the cone of the volcano collapses to fill the empty space.
You could use a wooden block, a Styrofoam cone, a birthday party hat... anything like that.
The cone volcano was enormously large.
Fred Cone - baseball - was born in 1848-05.
Fred Cone - baseball - died on 1909-04-13.
A large cone has a greater volume than a small frustum while a small cone has a smaller volume than a large frustum
The flat and the curved surfaces. In ice cream cone terms the ice cream and the cone are the two surfaces. Even if you eat the ice cream and the cone gets empty there are 2 surfaces, the inside and the outside curved surfaces.
A cone has two faces. The large triangular part and the circular part at the bottom.
An empty cone (like an ice-cream cone) doesn't have any flat surfaces. It has two curved surfaces, one outside and one inside. A solid cone has a flat base, and one other curved surface.
Most eruptions from a cinder cone are explosive, though not very large.
Fred Cone was born ? , 1848, in Rockford, IL, USA.