Across
1
Molten rock beneath Earth surface
3
Curved glass that refracts light
4
Fourth state of matter
6
Push or pull on an object
8
Center of an atom or cell
10
Substance with pH below 7
Down
2
Ball of burning gas in space
4
Tectonic landmass section
5
Tissue that contracts for movement
7
Element found in all living things
9
Unit of electric potential