Across
1
Nerve cell in the brain
3
Basic unit of life
6
Positive particle in nucleus
7
Molten rock beneath Earth surface
8
Second lightest element
9
Magnetic metallic element
10
Particle of light
Down
1
Unit of force
2
Push or pull on an object
3
Reddish electrical conductor
4
Compound containing oxygen
5
Disturbance that transfers energy