Across
1
Hottest planet in solar system
4
Unit of force
5
Fourth state of matter
6
Magnetic metallic element
7
Compound containing oxygen
10
Molten rock beneath Earth surface
11
Substance with pH above 7
Down
2
Disturbance that transfers energy
3
Natural satellite of Earth
5
Particle of light
8
Unit of energy
9
Chemical element in table salt
12
Basic unit of life