Across
1
Tectonic landmass section
4
Molten rock beneath Earth surface
6
Nerve cell in the brain
8
Curved glass that refracts light
9
Substance with pH below 7
10
Biological catalyst
Down
2
Second lightest element
3
Basic unit of life
4
Measure of matter in an object
5
Unit of heredity
7
Chemical element in table salt