Across
1
Element found in all living things
5
Force that attracts objects together
7
Particle of light
8
Solid with repeating atomic pattern
9
Group of similar cells
11
Chemical element in table salt
Down
2
Tissue that contracts for movement
3
Naturally occurring inorganic solid
4
Mass per unit volume
6
Unit of power
8
Reddish electrical conductor
10
Disturbance that transfers energy