Across
1
Tissue that contracts for movement
4
Nerve cell in the brain
7
Smallest unit of an element
9
Ball of burning gas in space
12
Hottest planet in solar system
Down
2
Precious yellow metallic element
3
Glass that splits light into spectrum
5
Chemical element in table salt
6
Unit of energy
8
Molten rock beneath Earth surface
10
Positive particle in nucleus
11
Blocking of light by a celestial body