Across
1
Element found in all living things
2
Molten rock beneath Earth surface
4
Substance with pH below 7
5
The Red Planet
6
Amplified beam of light
8
Hottest planet in solar system
10
Unit of electric potential
Down
2
Tissue that contracts for movement
3
Substance with pH above 7
4
Smallest unit of an element
7
Nerve cell in the brain
9
Gas form of a liquid