Across
1
Gas essential for breathing
3
Positive particle in nucleus
5
Fourth state of matter
6
Unit of energy
8
Unit of power
12
Precious yellow metallic element
Down
2
Element found in all living things
3
Tectonic landmass section
4
Unit of heredity
7
Group of similar cells
9
Absolute temperature scale unit
10
Path of a planet around the sun
11
Naturally occurring inorganic solid