Across
1
Smallest unit of an element
4
Basic unit of life
5
Ball of burning gas in space
6
Glass that splits light into spectrum
8
Natural satellite of Earth
10
Fourth state of matter
12
Tectonic landmass section
Down
2
Naturally occurring inorganic solid
3
Element found in all living things
7
Biological catalyst
9
Gas form of a liquid
11
Measure of matter in an object
13
Unit of power