Across
1
Element found in all living things
3
Group of similar cells
5
Fourth state of matter
8
Molten rock beneath Earth surface
9
Unit of power
10
Gas essential for breathing
Down
1
Icy body with a tail near the sun
2
Curved glass that refracts light
4
Ball of burning gas in space
6
Tectonic landmass section
7
Mass per unit volume