Across
1
Reddish electrical conductor
4
Hottest planet in solar system
5
Blocking of light by a celestial body
6
Nerve cell in the brain
10
Mass per unit volume
Down
2
Tectonic landmass section
3
Compound containing oxygen
4
Infectious microscopic agent
7
Unit of heredity
8
Second lightest element
9
Particle of light
11
Unit of energy