Across
1
Element found in all living things
3
Icy body with a tail near the sun
4
Curved glass that refracts light
7
Unit of heredity
8
Group of similar cells
10
Solid with repeating atomic pattern
Down
1
Reddish electrical conductor
2
Compound containing oxygen
5
Natural satellite of Earth
6
Positive particle in nucleus
9
Unit of force
11
Form of thermal energy