Across
1
Disturbance that transfers energy
4
Blocking of light by a celestial body
6
Basic unit of life
7
Curved glass that refracts light
8
Reddish electrical conductor
Down
2
Ball of burning gas in space
3
Unit of heredity
5
Element found in all living things
6
Icy body with a tail near the sun
9
Group of similar cells
10
Unit of electric potential
11
Tissue that contracts for movement