Across
1
The Red Planet
2
Unit of power
4
Unit of force
5
Curved glass that refracts light
7
Group of similar cells
9
Substance with pH below 7
11
Amplified beam of light
Down
1
Naturally occurring inorganic solid
3
Hottest planet in solar system
6
Solid with repeating atomic pattern
8
Nerve cell in the brain
10
Preserved remains of ancient life