Across
1
Path of a planet around the sun
4
Particle of light
5
Unit of heredity
6
Compound containing oxygen
8
Preserved remains of ancient life
10
Unit of electric potential
Down
2
Magnetic metallic element
3
Blocking of light by a celestial body
4
Glass that splits light into spectrum
7
Push or pull on an object
9
Disturbance that transfers energy
11
Infectious microscopic agent