Across
1
Gas essential for breathing
5
Curved glass that refracts light
6
Particle of light
8
Gas form of a liquid
Down
2
Biological catalyst
3
Push or pull on an object
4
Blocking of light by a celestial body
7
Element found in all living things
Gas essential for breathing
Curved glass that refracts light
Particle of light
Gas form of a liquid
Biological catalyst
Push or pull on an object
Blocking of light by a celestial body
Element found in all living things