Across
1
Our home planet
4
Solid with repeating atomic pattern
5
The Red Planet
6
Second lightest element
7
Unit of electric potential
10
Naturally occurring inorganic solid
11
Unit of heredity
Down
2
Disturbance that transfers energy
3
Group of similar cells
4
Reddish electrical conductor
7
Gas form of a liquid
8
Amplified beam of light
9
Biological catalyst
12
Blocking of light by a celestial body