Across
1
Chemical element in table salt
5
Curved glass that refracts light
7
Preserved remains of ancient life
8
Biological catalyst
9
Fourth state of matter
10
Unit of power
13
Gas form of a liquid
Down
2
Solid with repeating atomic pattern
3
Compound containing oxygen
4
Hottest planet in solar system
6
Nerve cell in the brain
10
Disturbance that transfers energy
11
Our home planet
12
Glass that splits light into spectrum