Across
1
Unit of energy
4
Tectonic landmass section
6
Gas essential for breathing
7
Disturbance that transfers energy
9
Hottest planet in solar system
11
Second lightest element
12
Glass that splits light into spectrum
Down
2
Tissue that contracts for movement
3
Unit of force
4
Fourth state of matter
5
Molten rock beneath Earth surface
8
Positive particle in nucleus
10
Precious yellow metallic element