in some cases yes e.g sugar is a solid but moves like a liquid so yes solids can flow
A solid does not flow easily.
The lithosphere is solid and does not flow, but is carried on top of the asthenosphere.
It cannot flow because its not hot
yes indeed solids can flow as well. all states of matter are fluids.
This depends on how dense the solid is, and how dense the liquid is.
yes because it is a solid that can move
Generally, no. That's what makes it a solid. Unless of course the solid has holes in it.
SOLID
smoothly
A glacier is an example of a solid that flows, albeit very slowly.
plasticity
yes it is