Across
1
Push or pull on an object
4
Unit of power
5
Amplified beam of light
8
Unit of force
Down
2
Element found in all living things
3
Group of similar cells
6
Icy body with a tail near the sun
7
Glass that splits light into spectrum
9
Naturally occurring inorganic solid
10
Path of a planet around the sun
11
Curved glass that refracts light