Across
1
Absolute temperature scale unit
4
Icy body with a tail near the sun
6
Path of a planet around the sun
8
Particle of light
Down
2
Tissue that contracts for movement
3
Nerve cell in the brain
5
Form of thermal energy
7
Disturbance that transfers energy
9
Ball of burning gas in space
10
Precious yellow metallic element
11
Substance with pH below 7