Across
1
Gas essential for breathing
3
Glass that splits light into spectrum
5
Absolute temperature scale unit
7
Chemical element in table salt
8
The Red Planet
9
Tectonic landmass section
13
Infectious microscopic agent
Down
2
Group of similar cells
4
Center of an atom or cell
6
Unit of electric potential
10
Natural satellite of Earth
11
Amplified beam of light
12
Unit of energy