Across
1
Substance with pH above 7
3
Tectonic landmass section
4
Gas form of a liquid
5
Form of thermal energy
9
Unit of heredity
11
Ball of burning gas in space
Down
2
Path of a planet around the sun
3
Glass that splits light into spectrum
6
Blocking of light by a celestial body
7
Compound containing oxygen
8
Our home planet
10
Solid with repeating atomic pattern