Across
1
Hottest planet in solar system
5
Form of thermal energy
6
Substance with pH below 7
7
Solid with repeating atomic pattern
8
Glass that splits light into spectrum
10
Unit of heredity
Down
2
Element found in all living things
3
Substance with pH above 7
4
Blocking of light by a celestial body
9
Fourth state of matter
11
Compound containing oxygen
12
Amplified beam of light