Across
1
Molten rock beneath Earth surface
4
Tectonic landmass section
5
Ball of burning gas in space
7
Gas essential for breathing
9
Natural satellite of Earth
11
The Red Planet
12
Substance with pH above 7
Down
2
Substance with pH below 7
3
Tissue that contracts for movement
6
Push or pull on an object
8
Unit of force
10
Mass per unit volume