Across
1
Infectious microscopic agent
4
Unit of force
5
Blocking of light by a celestial body
6
Second lightest element
8
Smallest unit of an element
9
Tectonic landmass section
10
Substance with pH below 7
Down
2
Substance with pH above 7
3
Solid with repeating atomic pattern
7
Measure of matter in an object
9
Glass that splits light into spectrum
11
Center of an atom or cell
12
Natural satellite of Earth