Across
1
Absolute temperature scale unit
3
Tectonic landmass section
6
Compound containing oxygen
8
Tissue that contracts for movement
9
Molten rock beneath Earth surface
10
Smallest unit of an element
11
Second lightest element
12
Ball of burning gas in space
Down
2
Biological catalyst
3
Fourth state of matter
4
Our home planet
5
Natural satellite of Earth
7
Gas essential for breathing