Across
1
Unit of electric potential
3
Unit of force
4
Our home planet
5
Amplified beam of light
7
Molten rock beneath Earth surface
8
Unit of heredity
10
Ball of burning gas in space
12
Nerve cell in the brain
Down
1
Infectious microscopic agent
2
Naturally occurring inorganic solid
6
Unit of energy
9
Gas form of a liquid
11
Second lightest element