Across
1
Molten rock beneath Earth surface
3
Center of an atom or cell
6
Precious yellow metallic element
7
Amplified beam of light
8
Particle of light
9
Path of a planet around the sun
12
Compound containing oxygen
Down
1
The Red Planet
2
Unit of heredity
4
Element found in all living things
5
Chemical element in table salt
8
Tectonic landmass section
10
Fourth state of matter
11
Group of similar cells