Across
1
Tissue that contracts for movement
2
Positive particle in nucleus
4
Smallest unit of an element
5
Tectonic landmass section
6
Compound containing oxygen
10
Center of an atom or cell
Down
2
Glass that splits light into spectrum
3
Icy body with a tail near the sun
5
Fourth state of matter
7
Unit of heredity
8
Unit of power
9
Chemical element in table salt
11
Amplified beam of light
12
Element found in all living things