Across
1
Naturally occurring inorganic solid
3
Nerve cell in the brain
5
Tissue that contracts for movement
8
Particle of light
9
Icy body with a tail near the sun
Down
1
Natural satellite of Earth
2
Amplified beam of light
4
Measure of matter in an object
6
Molten rock beneath Earth surface
7
Biological catalyst
8
Glass that splits light into spectrum