How to prove sand is not a fluid even if it takes the shape of a container

Solids can be any size or shape. Sand is a solid that has the ability to be poured like a liquid and take the shape of its container. It is still a solid, as each individual grain of sand has a shape of its own and keeps that shape.

Explanation:

not moving. pos accel,

because growing process had stoped after 4-5 year