Across
1
Molten rock beneath Earth surface
3
Particle of light
5
Infectious microscopic agent
6
Ball of burning gas in space
8
Basic unit of life
Down
1
Measure of matter in an object
2
Precious yellow metallic element
3
Tectonic landmass section
4
Fourth state of matter
7
Mass per unit volume
9
Form of thermal energy
10
Naturally occurring inorganic solid