Across
1
Force that attracts objects together
4
Natural satellite of Earth
5
Unit of energy
7
Naturally occurring inorganic solid
9
Curved glass that refracts light
Down
2
Disturbance that transfers energy
3
Second lightest element
6
Path of a planet around the sun
8
Amplified beam of light
10
Push or pull on an object
11
Gas form of a liquid