Across
1
Second lightest element
3
Element found in all living things
7
Disturbance that transfers energy
8
Naturally occurring inorganic solid
9
Infectious microscopic agent
12
Substance with pH above 7
13
Magnetic metallic element
14
Curved glass that refracts light
Down
2
Gas essential for breathing
4
Unit of energy
5
Tectonic landmass section
6
Nerve cell in the brain
10
Fourth state of matter
11
Amplified beam of light