Across
1
Tectonic landmass section
3
Infectious microscopic agent
4
Gas essential for breathing
7
Molten rock beneath Earth surface
8
Center of an atom or cell
9
Form of thermal energy
10
Glass that splits light into spectrum
Down
2
Nerve cell in the brain
5
Smallest unit of an element
6
Unit of heredity
7
The Red Planet
11
Precious yellow metallic element