Across
1
Biological catalyst
3
Precious yellow metallic element
4
Blocking of light by a celestial body
5
Solid with repeating atomic pattern
6
Form of thermal energy
10
Unit of force
Down
2
Absolute temperature scale unit
3
Unit of heredity
4
Our home planet
7
Amplified beam of light
8
The Red Planet
9
Ball of burning gas in space
11
Unit of electric potential
12
Substance with pH below 7