Across
1
Path of a planet around the sun
3
Curved glass that refracts light
6
Smallest unit of an element
7
Disturbance that transfers energy
8
Our home planet
9
Glass that splits light into spectrum
11
Fourth state of matter
Down
2
Unit of force
3
Amplified beam of light
4
Unit of heredity
5
Solid with repeating atomic pattern
10
Naturally occurring inorganic solid