Across
1
Preserved remains of ancient life
3
Our home planet
4
Solid with repeating atomic pattern
6
Chemical element in table salt
10
Biological catalyst
12
Compound containing oxygen
Down
2
Unit of electric potential
4
Basic unit of life
5
Unit of force
7
Mass per unit volume
8
Center of an atom or cell
9
Substance with pH above 7
11
Molten rock beneath Earth surface