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: -Properties of amorphous solids are different in many ways from those of crystalline solids. The intermolecular forces in amorphous solids do not have a regular external structure, and they do not have sharp melting points.