Across
1
Unit of energy
3
Path of a planet around the sun
6
Substance with pH below 7
7
Blocking of light by a celestial body
9
Absolute temperature scale unit
11
Substance with pH above 7
Down
2
Magnetic metallic element
4
Element found in all living things
5
Group of similar cells
8
Our home planet
10
Tectonic landmass section