Across
1
Group of similar cells
2
Icy body with a tail near the sun
3
Molten rock beneath Earth surface
7
Form of thermal energy
10
The Red Planet
11
Tissue that contracts for movement
Down
2
Solid with repeating atomic pattern
4
Smallest unit of an element
5
Nerve cell in the brain
6
Precious yellow metallic element
8
Disturbance that transfers energy
9
Amplified beam of light
12
Chemical element in table salt