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View submission: Is sand a liquid???
What defines a liquid is its tendency to deform continuously under a continuous shear force.
I’ll add an important qualifier: over the time scale of interest/relevance. Solids creep[1]—exhibit viscous flow—in response to a load, including their own weight. Familiar examples include glaciers, lead pipes, and elastomers, all of which progressively slump over decades or faster. Because we like our solid structures to stay in place, we routinely engineer this aspect away through various strategies, including alloying, crosslinking, grain size maximization, and temperature minimization.
1: https://en.m.wikipedia.org/wiki/Creep_(deformation)
There's nothing here!