Across
1
Biological catalyst
2
Particle of light
3
Solid with repeating atomic pattern
4
Smallest unit of an element
6
Reddish electrical conductor
7
Amplified beam of light
10
Infectious microscopic agent
Down
1
Blocking of light by a celestial body
2
Fourth state of matter
5
Tissue that contracts for movement
6
Icy body with a tail near the sun
8
Measure of matter in an object
9
Disturbance that transfers energy
11
Nerve cell in the brain