Across
1
Center of an atom or cell
3
Smallest unit of an element
6
Molten rock beneath Earth surface
7
Compound containing oxygen
10
Reddish electrical conductor
11
Blocking of light by a celestial body
Down
2
Particle of light
4
Unit of force
5
Our home planet
6
Tissue that contracts for movement
8
Element found in all living things
9
Unit of heredity