Across
1
Amplified beam of light
4
Tectonic landmass section
5
Preserved remains of ancient life
6
Curved glass that refracts light
7
Our home planet
8
The Red Planet
10
Center of an atom or cell
Down
2
Absolute temperature scale unit
3
Second lightest element
5
Push or pull on an object
9
Basic unit of life
10
Nerve cell in the brain
11
Biological catalyst