Across
1
Our home planet
4
Gas essential for breathing
7
Amplified beam of light
8
Nerve cell in the brain
9
Center of an atom or cell
Down
2
Particle of light
3
Unit of force
5
Unit of energy
6
Compound containing oxygen
Our home planet
Gas essential for breathing
Amplified beam of light
Nerve cell in the brain
Center of an atom or cell
Particle of light
Unit of force
Unit of energy
Compound containing oxygen