Across
1
Compound containing oxygen
4
Preserved remains of ancient life
5
Second lightest element
6
Path of a planet around the sun
7
Absolute temperature scale unit
9
Unit of electric potential
Down
2
Unit of force
3
Magnetic metallic element
8
Solid with repeating atomic pattern
9
Hottest planet in solar system
10
Our home planet
11
Ball of burning gas in space
12
Infectious microscopic agent