Burning of Magnesium ribbon is a ________ change.

_________ acts as a natural shield against ultraviolet radiations.

A change in which a substance undergoes a change in its physical properties is called a ________ change.

A change  in which  composition and  chemical properties of the substance gets changed is called___________. 

__________ burns with a brilliant white light.

___________ is known as blue Vitriol.

Burning of any substance is a _________ change.

The formation of rust on the surface of iron is called __________ of iron. 

A chemical change is also called __________.

Chemical changes are  ___________.