Across
1
Smallest unit of an element
2
Particle of light
4
Preserved remains of ancient life
8
Naturally occurring inorganic solid
9
Gas form of a liquid
Down
1
Substance with pH below 7
2
Glass that splits light into spectrum
3
Unit of electric potential
4
Push or pull on an object
5
The Red Planet
6
Unit of force
7
Magnetic metallic element