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Air Quality Puzzle

Across
Chemicals, particles, or organisms to air that are harmful to living things and structures.
A combination of two or more atoms.
Matter that has definite volume but not a definite shape
Molecules and atoms combined together
The simplest type of substance made up of identical atoms
The transfer of thermal energy to a cooler energy
Amount of stuff
When liquid turns into a solid
Used to measure mass
Matter that has definite shape and volume
The basic building block of matter
The condition of the air
Matter that has no definite shape or volume
Anything the has volume
Something that can make air harmful
Things you cannot see with your unaided eyes
Down
Measure of how much space something takes up
Something that contains a substance that's harmful to people, animals, plants, and structures
Matter that forms from gases at high temperatures
The energy of motion of the particles of matter in a substance
When a liquid turns into a gas
A change from liquid to gas at a temperature less than boiling point
Gas turning into a liquid
When a solid turns into a liquid
The average of particles in matter
A substance changing from a solid to a gas
When a liquid turns into a solid
An observation that can be seen by the unaided eye
A form or type of something