Across
1
Basic unit of life
3
Unit of force
6
Molten rock beneath Earth surface
8
Nerve cell in the brain
9
Unit of energy
Down
2
Group of similar cells
4
Second lightest element
5
Particle of light
7
Positive particle in nucleus
Basic unit of life
Unit of force
Molten rock beneath Earth surface
Nerve cell in the brain
Unit of energy
Group of similar cells
Second lightest element
Particle of light
Positive particle in nucleus