Across
1
Substance with pH below 7
4
Icy body with a tail near the sun
5
Tectonic landmass section
6
Mass per unit volume
8
Naturally occurring inorganic solid
10
Group of similar cells
Down
2
Absolute temperature scale unit
3
Unit of power
5
Particle of light
7
Tissue that contracts for movement
9
Path of a planet around the sun