Across
1
Naturally occurring inorganic solid
5
Unit of heredity
6
Group of similar cells
9
Positive particle in nucleus
10
Tissue that contracts for movement
12
Disturbance that transfers energy
Down
2
Blocking of light by a celestial body
3
Hottest planet in solar system
4
Molten rock beneath Earth surface
7
Unit of energy
8
Compound containing oxygen
11
Fourth state of matter