Across
1
Second lightest element
3
Form of thermal energy
5
Push or pull on an object
6
Reddish electrical conductor
7
The Red Planet
10
Naturally occurring inorganic solid
11
Group of similar cells
Down
2
Unit of heredity
4
Chemical element in table salt
6
Icy body with a tail near the sun
8
Infectious microscopic agent
9
Substance with pH below 7