A kind of changes in matter that does not involve a chemical reaction.

Changes in matter when it becomes new ordifferent matter is called?

A process of changing from a solid to a gas without passing through a liquid  phase.

It is the effect ofundesirable changes in our surroundings that have harmful effects on plants, animals and human beings.

 When a substance undergoes a _____________ , it is changed into a differentsubstance with different properties.

This occurs at any temperature between themelting point and the boiling point.

It is the change of a gas or vapor to a liquid,either by cooling it or by subjecting the substance to an increase in pressure.

A change in a substance from a solid to a liquid state by heating it to the melting point is called?

A change in a substance from a liquid to a solid state by cooling it to the freezing point is called?

Anything like  solid, liquid or gas that cause pollution is called?

It happens when a toxic subtances enter in the bodies of water that can harm  aquatic organisms.

It occurs due to the presence of undesirable solid or gaseous particles in the air in quantitiesthat are harmful to human health and environment.

Too much freezing and melting deforms plastic wares and other household materials.

Global warming made acid pollution that can cause harm to our environment.

Condensation is important in transforming watervapor to droplets water stored in clouds.