Across
1
Disturbance that transfers energy
4
Compound containing oxygen
5
Basic unit of life
6
Gas essential for breathing
8
Hottest planet in solar system
11
Substance with pH below 7
Down
2
Amplified beam of light
3
Center of an atom or cell
7
Nerve cell in the brain
9
Naturally occurring inorganic solid
10
Tectonic landmass section