Across
1
Element found in all living things
3
Ball of burning gas in space
6
Preserved remains of ancient life
7
Icy body with a tail near the sun
9
Unit of force
11
Basic unit of life
Down
2
Molten rock beneath Earth surface
4
Group of similar cells
5
Absolute temperature scale unit
8
Precious yellow metallic element
10
Reddish electrical conductor