Across
1
Fourth state of matter
4
Absolute temperature scale unit
6
Center of an atom or cell
7
Molten rock beneath Earth surface
9
Unit of power
10
Gas essential for breathing
Down
2
Solid with repeating atomic pattern
3
Element found in all living things
5
Preserved remains of ancient life
7
Tissue that contracts for movement
8
Smallest unit of an element
11
Ball of burning gas in space