Across
1
Natural satellite of Earth
3
Fourth state of matter
6
Gas essential for breathing
8
The Red Planet
9
Tissue that contracts for movement
10
Group of similar cells
Down
2
Smallest unit of an element
3
Tectonic landmass section
4
Curved glass that refracts light
5
Icy body with a tail near the sun
7
Element found in all living things
11
Unit of energy