Across
1
Molten rock beneath Earth surface
4
Basic unit of life
5
Group of similar cells
6
Compound containing oxygen
7
Preserved remains of ancient life
8
Center of an atom or cell
9
Measure of matter in an object
Down
2
Second lightest element
3
Naturally occurring inorganic solid
9
The Red Planet
10
Tectonic landmass section
11
Amplified beam of light