Clarification question: Difference between solid, surface, curve, and points?

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Pretty much what the title of this question says. Very confused about how these 4 things differ themselves from each other. Furthermore, how do they differ with regards to boundaries? Does anybody have some intuitive explanation? Thanks!

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In short: dimension ($3$ for a solid, $2$ for a surface, $1$ for a curve, $0$ for a point).