Across
1
Tissue that contracts for movement
2
Particle of light
3
Molten rock beneath Earth surface
5
Unit of energy
6
Unit of force
8
Solid with repeating atomic pattern
9
Icy body with a tail near the sun
12
Reddish electrical conductor
Down
2
Fourth state of matter
4
Blocking of light by a celestial body
7
Ball of burning gas in space
9
Element found in all living things
10
Substance with pH above 7
11
Center of an atom or cell