Across
1
Basic unit of life
3
Form of thermal energy
5
Fourth state of matter
7
Element found in all living things
9
Smallest unit of an element
10
Icy body with a tail near the sun
11
Nerve cell in the brain
Down
2
Disturbance that transfers energy
4
Curved glass that refracts light
5
Particle of light
6
Tissue that contracts for movement
8
Push or pull on an object
9
Substance with pH below 7
11
Center of an atom or cell