Across
1
Second lightest element
4
Tissue that contracts for movement
5
Solid with repeating atomic pattern
9
Chemical element in table salt
10
Positive particle in nucleus
12
Form of thermal energy
Down
2
Unit of force
3
Molten rock beneath Earth surface
6
Reddish electrical conductor
7
Naturally occurring inorganic solid
8
Push or pull on an object
11
Infectious microscopic agent