Across
1
Biological catalyst
4
Unit of force
5
Unit of electric potential
7
Substance with pH below 7
8
Hottest planet in solar system
9
Ball of burning gas in space
10
Tectonic landmass section
Down
2
Amplified beam of light
3
Our home planet
6
Unit of heredity
11
Compound containing oxygen
12
Molten rock beneath Earth surface