Across
1
Gas form of a liquid
4
Tissue that contracts for movement
5
Smallest unit of an element
6
Compound containing oxygen
9
Our home planet
11
Positive particle in nucleus
14
Particle of light
Down
2
Blocking of light by a celestial body
3
Naturally occurring inorganic solid
7
Gas essential for breathing
8
Chemical element in table salt
10
Precious yellow metallic element
12
Unit of power
13
Amplified beam of light