Across
1
Precious yellow metallic element
4
Group of similar cells
6
Hottest planet in solar system
7
Molten rock beneath Earth surface
9
Tissue that contracts for movement
12
Positive particle in nucleus
13
Unit of force
Down
2
Compound containing oxygen
3
Chemical element in table salt
5
Second lightest element
8
Amplified beam of light
10
Element found in all living things
11
Naturally occurring inorganic solid