Across
1
Biological catalyst
5
Reddish electrical conductor
6
Basic unit of life
7
Our home planet
9
Unit of heredity
12
Center of an atom or cell
Down
2
Amplified beam of light
3
Unit of energy
4
Molten rock beneath Earth surface
8
Substance with pH below 7
10
Tectonic landmass section
11
Naturally occurring inorganic solid