Across
1
Element found in all living things
3
Biological catalyst
6
Measure of matter in an object
7
Hottest planet in solar system
10
Precious yellow metallic element
Down
2
Curved glass that refracts light
4
Disturbance that transfers energy
5
Molten rock beneath Earth surface
8
Ball of burning gas in space
9
Unit of energy
11
Compound containing oxygen
12
Unit of force