Across
1
Element found in all living things
5
Blocking of light by a celestial body
6
Particle of light
7
Hottest planet in solar system
10
Compound containing oxygen
Down
2
Tissue that contracts for movement
3
Reddish electrical conductor
4
Chemical element in table salt
8
Absolute temperature scale unit
9
Precious yellow metallic element
11
Gas essential for breathing
12
Curved glass that refracts light
13
Our home planet