Across
1
Unit of electric potential
3
Center of an atom or cell
8
Group of similar cells
9
Our home planet
10
Tissue that contracts for movement
11
Form of thermal energy
12
Measure of matter in an object
Down
1
Hottest planet in solar system
2
Amplified beam of light
4
Unit of power
5
Solid with repeating atomic pattern
6
Curved glass that refracts light
7
Preserved remains of ancient life