Across
1
Fourth state of matter
2
Basic unit of life
4
Center of an atom or cell
6
Nerve cell in the brain
7
Preserved remains of ancient life
Down
1
Particle of light
2
Solid with repeating atomic pattern
3
Substance with pH above 7
5
Tissue that contracts for movement
8
Curved glass that refracts light
9
Our home planet
10
Push or pull on an object