Across
1
Chemical element in table salt
3
Form of thermal energy
4
Glass that splits light into spectrum
6
Second lightest element
7
Our home planet
9
Basic unit of life
13
Element found in all living things
Down
2
Unit of force
4
Tectonic landmass section
5
Naturally occurring inorganic solid
8
Nerve cell in the brain
10
Molten rock beneath Earth surface
11
Absolute temperature scale unit
12
Center of an atom or cell