Across
1
Fourth state of matter
4
Magnetic metallic element
5
Biological catalyst
8
Reddish electrical conductor
10
Smallest unit of an element
11
Substance with pH below 7
Down
1
Particle of light
2
The Red Planet
3
Disturbance that transfers energy
6
Molten rock beneath Earth surface
7
Infectious microscopic agent
9
Path of a planet around the sun
12
Second lightest element
13
Tissue that contracts for movement