Across
1
Group of similar cells
4
Molten rock beneath Earth surface
5
Glass that splits light into spectrum
9
Element found in all living things
10
Nerve cell in the brain
11
Fourth state of matter
Down
2
Smallest unit of an element
3
Chemical element in table salt
6
Unit of heredity
7
Ball of burning gas in space
8
Magnetic metallic element
12
Particle of light