Across
1
Naturally occurring inorganic solid
5
Smallest unit of an element
6
Amplified beam of light
7
Unit of energy
10
Gas essential for breathing
Down
1
Tissue that contracts for movement
2
Unit of force
3
Blocking of light by a celestial body
4
Force that attracts objects together
8
Disturbance that transfers energy
9
Positive particle in nucleus
11
Gas form of a liquid