Across
1
Reddish electrical conductor
2
Naturally occurring inorganic solid
4
Hottest planet in solar system
5
Path of a planet around the sun
7
Basic unit of life
8
Unit of heredity
12
Positive particle in nucleus
Down
2
The Red Planet
3
Chemical element in table salt
4
Unit of electric potential
5
Compound containing oxygen
6
Blocking of light by a celestial body
9
Form of thermal energy
10
Preserved remains of ancient life
11
Disturbance that transfers energy