Across
1
Icy body with a tail near the sun
4
Infectious microscopic agent
7
Naturally occurring inorganic solid
8
Chemical element in table salt
9
Substance with pH below 7
10
Unit of energy
Down
2
Tissue that contracts for movement
3
Measure of matter in an object
5
Unit of power
6
Mass per unit volume
11
Path of a planet around the sun