Across
1
Fourth state of matter
3
The Red Planet
4
Nerve cell in the brain
5
Ball of burning gas in space
7
Unit of force
8
Tissue that contracts for movement
Down
1
Glass that splits light into spectrum
2
Biological catalyst
3
Naturally occurring inorganic solid
6
Preserved remains of ancient life
9
Unit of energy
10
Blocking of light by a celestial body
11
Smallest unit of an element
12
Gas form of a liquid