Across
1
Substance with pH below 7
3
Unit of force
4
Reddish electrical conductor
6
Infectious microscopic agent
7
Group of similar cells
8
Form of thermal energy
Down
2
Push or pull on an object
4
Icy body with a tail near the sun
5
Mass per unit volume
8
Second lightest element
9
Ball of burning gas in space
10
Unit of heredity