Across
1
Disturbance that transfers energy
4
Nerve cell in the brain
5
The Red Planet
6
Glass that splits light into spectrum
7
Magnetic metallic element
8
Smallest unit of an element
Down
2
Push or pull on an object
3
Amplified beam of light
5
Naturally occurring inorganic solid
6
Tectonic landmass section
9
Path of a planet around the sun