Across
1
Amplified beam of light
3
Fourth state of matter
5
Infectious microscopic agent
6
Gas essential for breathing
7
Unit of power
9
Element found in all living things
Down
2
Measure of matter in an object
3
Particle of light
4
Blocking of light by a celestial body
8
Substance with pH above 7
10
Substance with pH below 7
11
Positive particle in nucleus
12
Gas form of a liquid