Across
1
Element found in all living things
4
Particle of light
5
Precious yellow metallic element
6
Form of thermal energy
8
Infectious microscopic agent
9
Group of similar cells
Down
2
Absolute temperature scale unit
3
Blocking of light by a celestial body
7
Path of a planet around the sun
10
Our home planet
11
Curved glass that refracts light
12
Solid with repeating atomic pattern