Across
1
Naturally occurring inorganic solid
5
Blocking of light by a celestial body
9
Icy body with a tail near the sun
11
Smallest unit of an element
Down
2
Infectious microscopic agent
3
Unit of electric potential
4
Curved glass that refracts light
6
Basic unit of life
7
Tissue that contracts for movement
8
Glass that splits light into spectrum
10
Ball of burning gas in space
12
Unit of power