1) Amorphous means “without form or structure".
In amorphous solid atoms and molecules are not organized in a definite lattice pattern. For example plastic, gel or glass.
Crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
2) Amorphous solids do not have definite melting points.
Crystalline solids have definitive melting point.
