Across
1
Solid with repeating atomic pattern
3
Measure of matter in an object
5
Curved glass that refracts light
6
Magnetic metallic element
7
Naturally occurring inorganic solid
11
Preserved remains of ancient life
Down
2
Mass per unit volume
3
Tissue that contracts for movement
4
Unit of energy
8
Group of similar cells
9
Gas form of a liquid
10
Positive particle in nucleus