Across
1
Naturally occurring inorganic solid
4
Substance with pH below 7
5
Chemical element in table salt
7
Blocking of light by a celestial body
8
Amplified beam of light
9
Basic unit of life
11
Particle of light
Down
2
Solid with repeating atomic pattern
3
Infectious microscopic agent
6
Preserved remains of ancient life
10
Mass per unit volume