Across
1
Smallest unit of an element
3
Disturbance that transfers energy
4
Particle of light
5
Naturally occurring inorganic solid
8
Basic unit of life
Down
2
Amplified beam of light
4
Glass that splits light into spectrum
6
Second lightest element
7
Blocking of light by a celestial body
9
Unit of force
10
Icy body with a tail near the sun