Across
1
Blocking of light by a celestial body
3
Element found in all living things
5
Smallest unit of an element
7
Center of an atom or cell
8
Measure of matter in an object
10
Amplified beam of light
Down
1
Biological catalyst
2
Infectious microscopic agent
4
Tectonic landmass section
6
Gas form of a liquid
9
Ball of burning gas in space