Across
1
Gas essential for breathing
2
Natural satellite of Earth
4
Absolute temperature scale unit
7
Precious yellow metallic element
8
The Red Planet
9
Ball of burning gas in space
10
Solid with repeating atomic pattern
11
Disturbance that transfers energy
Down
2
Tissue that contracts for movement
3
Center of an atom or cell
5
Gas form of a liquid
6
Naturally occurring inorganic solid
7
Unit of heredity