Across
1
Basic unit of life
4
Our home planet
5
Ball of burning gas in space
8
Second lightest element
Down
1
Icy body with a tail near the sun
2
Group of similar cells
3
Preserved remains of ancient life
6
Element found in all living things
7
Magnetic metallic element
9
Tectonic landmass section
10
Amplified beam of light