GENERAL GEOLOGY

Detailed explanation-1: -Crystalline solids have sharp well-melting points because all the components of a crystalline solid are present at the same distance from each other.

Detailed explanation-2: -The crystalline solids have a sharp melting point.

Detailed explanation-3: -The melting point of a substance is the temperature range over which the first crystal of a solid just starts to melt and the last crystal completes its melting.

Detailed explanation-4: -A material is said to have a sharp melting point if the range is less than 5ºC, and a material is said to have a broad melting point if the range is greater than about 5ºC. Pure compounds characteristically have a sharp melting range while most mixed or impure compounds have a broad melting range.

Detailed explanation-5: -The intermolecular forces in amorphous solids do not have a regular external structure, and they do not have sharp melting points. Unlike crystalline solids that have regular planes of cleavage, the physical properties of amorphous solids are the same in all directions.