Across
1
Basic unit of life
3
Push or pull on an object
5
Glass that splits light into spectrum
6
Nerve cell in the brain
7
Magnetic metallic element
10
Form of thermal energy
Down
2
Group of similar cells
3
Preserved remains of ancient life
4
Amplified beam of light
8
Substance with pH above 7
9
Particle of light
11
Our home planet