Solids have a definite shape because the atoms which make them up are locked firmly in place, and only through external forces (ie, if you cut a part of) or changing the state (melting it) will it become malleable.
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Solids have a fixed volume or shape at room temperature or pressure.
Solids change their shapes in many ways. Solids will melt if they are in hot temperatures, and this changes their shape.
Some semi-solids might, but a solid, by definition keeps it's original shape.
Those would be called similar solids.
A ball and a globe are two objects that are sphere shaped.