Across
1
Form of thermal energy
2
Basic unit of life
5
Magnetic metallic element
7
Tectonic landmass section
8
Icy body with a tail near the sun
10
Fourth state of matter
Down
2
Reddish electrical conductor
3
Disturbance that transfers energy
4
Preserved remains of ancient life
6
Nerve cell in the brain
9
Mass per unit volume