Question

what is sublimation give any four substances that sublime

Answer 1

Sublimation is the process due to which a solid directly changes to gaseous state and on cooling directly changes back to solid state without changing into liquid state.
For example; iodine, ammonium chloride,naphthalene,arsenic.

Answer 2

Sublimation is the process of transfer of solid substances directly into Gaseous state. Without passing the intermediate state Liquid ..

Examples are 

⇒ Dry ice
⇒ Camphor
⇒ Snow & ice ( On winter )
⇒ naphthalene
⇒Solid iodine
⇒Cadmium ( only at low pressure )