Across
1
Gas essential for breathing
5
Blocking of light by a celestial body
6
Compound containing oxygen
10
Substance with pH below 7
11
Infectious microscopic agent
12
Positive particle in nucleus
Down
2
Solid with repeating atomic pattern
3
Gas form of a liquid
4
Push or pull on an object
7
Path of a planet around the sun
8
Unit of energy
9
Chemical element in table salt