Across
1
Blocking of light by a celestial body
5
Reddish electrical conductor
6
Substance with pH above 7
7
Basic unit of life
10
Naturally occurring inorganic solid
11
Gas essential for breathing
12
Glass that splits light into spectrum
Down
2
Center of an atom or cell
3
Particle of light
4
Our home planet
8
Amplified beam of light
9
Tectonic landmass section
13
Unit of heredity