Across
1
Amplified beam of light
3
Unit of force
6
Form of thermal energy
8
Tissue that contracts for movement
11
Tectonic landmass section
Down
2
Hottest planet in solar system
4
Particle of light
5
Basic unit of life
7
Ball of burning gas in space
8
Measure of matter in an object
9
Group of similar cells
10
Our home planet
12
Substance with pH above 7