Across
1
Gas essential for breathing
2
Molten rock beneath Earth surface
3
Unit of power
5
Reddish electrical conductor
6
Substance with pH below 7
10
Tectonic landmass section
Down
1
Path of a planet around the sun
2
Naturally occurring inorganic solid
4
Unit of force
7
Mass per unit volume
8
Fourth state of matter
9
Solid with repeating atomic pattern