Across
1
Absolute temperature scale unit
3
Push or pull on an object
4
Tissue that contracts for movement
5
Preserved remains of ancient life
7
Particle of light
8
Nerve cell in the brain
9
Path of a planet around the sun
Down
2
Center of an atom or cell
4
Natural satellite of Earth
6
Amplified beam of light
10
Precious yellow metallic element