Across
1
Icy body with a tail near the sun
3
Absolute temperature scale unit
6
Preserved remains of ancient life
8
Natural satellite of Earth
9
Magnetic metallic element
10
Chemical element in table salt
11
Form of thermal energy
12
The Red Planet
Down
2
Naturally occurring inorganic solid
4
Unit of electric potential
5
Group of similar cells
7
Tissue that contracts for movement
13
Hottest planet in solar system