Across
1
Group of similar cells
5
Hottest planet in solar system
6
Magnetic metallic element
7
Substance with pH above 7
9
Disturbance that transfers energy
10
Our home planet
Down
2
Absolute temperature scale unit
3
Center of an atom or cell
4
Blocking of light by a celestial body
8
Unit of electric potential
11
Ball of burning gas in space
12
Fourth state of matter