Across
1
Unit of electric potential
4
Blocking of light by a celestial body
5
Preserved remains of ancient life
7
Substance with pH above 7
9
Gas form of a liquid
Down
2
Curved glass that refracts light
3
Path of a planet around the sun
6
Unit of energy
8
Second lightest element
10
Basic unit of life
11
Hottest planet in solar system
12
Tectonic landmass section