Across
1
Biological catalyst
4
Naturally occurring inorganic solid
7
Push or pull on an object
8
Ball of burning gas in space
9
Gas form of a liquid
10
Particle of light
12
Tectonic landmass section
Down
2
Unit of force
3
Nerve cell in the brain
5
Reddish electrical conductor
6
Blocking of light by a celestial body
11
Our home planet