Across
1
Amplified beam of light
4
Preserved remains of ancient life
5
Disturbance that transfers energy
7
Reddish electrical conductor
11
Glass that splits light into spectrum
12
Gas essential for breathing
Down
2
Blocking of light by a celestial body
3
Unit of energy
6
Infectious microscopic agent
8
Element found in all living things
9
Unit of force
10
Gas form of a liquid