Across
1
Disturbance that transfers energy
4
Naturally occurring inorganic solid
6
Unit of energy
9
Hottest planet in solar system
10
Blocking of light by a celestial body
11
Natural satellite of Earth
Down
2
Substance with pH above 7
3
Nerve cell in the brain
4
Tissue that contracts for movement
5
Glass that splits light into spectrum
7
Precious yellow metallic element
8
Gas form of a liquid
12
Form of thermal energy