Across
1
Magnetic metallic element
3
Basic unit of life
5
Gas essential for breathing
6
Element found in all living things
7
Biological catalyst
9
Precious yellow metallic element
Down
2
Compound containing oxygen
3
Icy body with a tail near the sun
4
Unit of force
8
Substance with pH below 7
9
Unit of heredity
10
Molten rock beneath Earth surface
11
Tectonic landmass section
12
Nerve cell in the brain
13
Disturbance that transfers energy