Across
1
Tectonic landmass section
3
Preserved remains of ancient life
5
Mass per unit volume
7
Substance with pH below 7
9
Infectious microscopic agent
Down
2
Ball of burning gas in space
4
Our home planet
6
Naturally occurring inorganic solid
8
Measure of matter in an object
10
Compound containing oxygen
11
Amplified beam of light