Across
1
Fourth state of matter
3
Gas essential for breathing
4
Basic unit of life
5
Blocking of light by a celestial body
6
Mass per unit volume
9
Glass that splits light into spectrum
Down
1
Tectonic landmass section
2
Solid with repeating atomic pattern
4
Icy body with a tail near the sun
7
The Red Planet
8
Amplified beam of light