Across
1
Precious yellow metallic element
4
Particle of light
5
Disturbance that transfers energy
8
Ball of burning gas in space
Down
2
Curved glass that refracts light
3
Substance with pH below 7
4
Tectonic landmass section
6
Our home planet
7
Biological catalyst
9
Compound containing oxygen
10
Amplified beam of light