Across
1
Infectious microscopic agent
3
Unit of heredity
4
Molten rock beneath Earth surface
5
Curved glass that refracts light
6
Second lightest element
8
Unit of force
9
Substance with pH above 7
Down
1
Hottest planet in solar system
2
Tissue that contracts for movement
3
Precious yellow metallic element
4
Naturally occurring inorganic solid
7
Particle of light
10
Group of similar cells