Across
1
Absolute temperature scale unit
3
Fourth state of matter
8
The Red Planet
9
Center of an atom or cell
12
Positive particle in nucleus
13
Measure of matter in an object
14
Magnetic metallic element
Down
2
Group of similar cells
4
Blocking of light by a celestial body
5
Solid with repeating atomic pattern
6
Hottest planet in solar system
7
Naturally occurring inorganic solid
10
Mass per unit volume
11
Disturbance that transfers energy