Across
1
Naturally occurring inorganic solid
2
Positive particle in nucleus
4
Element found in all living things
7
Icy body with a tail near the sun
8
The Red Planet
9
Unit of energy
10
Tissue that contracts for movement
Down
2
Particle of light
3
Nerve cell in the brain
4
Solid with repeating atomic pattern
5
Ball of burning gas in space
6
Push or pull on an object