Across
1
Compound containing oxygen
4
Form of thermal energy
5
Blocking of light by a celestial body
6
Element found in all living things
9
Natural satellite of Earth
Down
2
Unit of heredity
3
Positive particle in nucleus
6
Reddish electrical conductor
7
Push or pull on an object
8
Measure of matter in an object
10
Glass that splits light into spectrum
11
Group of similar cells
12
Curved glass that refracts light