Across
1
Group of similar cells
5
Fourth state of matter
6
Gas form of a liquid
7
Element found in all living things
9
Absolute temperature scale unit
11
Particle of light
13
Magnetic metallic element
Down
2
Center of an atom or cell
3
Positive particle in nucleus
4
Reddish electrical conductor
8
Force that attracts objects together
10
Nerve cell in the brain
12
Blocking of light by a celestial body