Across
1
Path of a planet around the sun
3
Center of an atom or cell
5
Fourth state of matter
7
The Red Planet
10
Substance with pH above 7
11
Magnetic metallic element
12
Compound containing oxygen
Down
2
Solid with repeating atomic pattern
4
Our home planet
6
Naturally occurring inorganic solid
8
Hottest planet in solar system
9
Amplified beam of light
13
Preserved remains of ancient life