Across
1
Chemical element in table salt
5
Second lightest element
6
Compound containing oxygen
7
Unit of heredity
9
Curved glass that refracts light
Down
2
Molten rock beneath Earth surface
3
Hottest planet in solar system
4
Absolute temperature scale unit
8
Infectious microscopic agent
10
Magnetic metallic element
11
Unit of electric potential
12
Basic unit of life