Across
1
Gas essential for breathing
4
Gas form of a liquid
5
Blocking of light by a celestial body
6
Unit of force
10
Ball of burning gas in space
11
Icy body with a tail near the sun
Down
2
Magnetic metallic element
3
Hottest planet in solar system
5
Biological catalyst
7
Substance with pH below 7
8
Compound containing oxygen
9
Absolute temperature scale unit