Across
1
Tectonic landmass section
3
Gas essential for breathing
4
Natural satellite of Earth
6
Tissue that contracts for movement
7
Mass per unit volume
8
Preserved remains of ancient life
9
The Red Planet
Down
2
Group of similar cells
4
Naturally occurring inorganic solid
5
Magnetic metallic element
10
Icy body with a tail near the sun
11
Fourth state of matter