Across
1
Solid with repeating atomic pattern
4
Icy body with a tail near the sun
6
Measure of matter in an object
8
Gas essential for breathing
9
Unit of heredity
10
Tissue that contracts for movement
Down
2
Glass that splits light into spectrum
3
Positive particle in nucleus
4
Basic unit of life
5
Fourth state of matter
7
Group of similar cells
11
Curved glass that refracts light