Across
1
Our home planet
4
The Red Planet
6
Substance with pH below 7
7
Preserved remains of ancient life
9
Magnetic metallic element
10
Tectonic landmass section
Down
2
Curved glass that refracts light
3
Element found in all living things
5
Gas form of a liquid
8
Blocking of light by a celestial body
11
Group of similar cells