Across
1
Biological catalyst
4
Glass that splits light into spectrum
5
Infectious microscopic agent
6
Preserved remains of ancient life
9
Group of similar cells
12
Unit of force
13
Blocking of light by a celestial body
Down
2
Absolute temperature scale unit
3
Center of an atom or cell
7
Molten rock beneath Earth surface
8
Compound containing oxygen
10
Path of a planet around the sun
11
Reddish electrical conductor