Across
1
Positive particle in nucleus
4
Solid with repeating atomic pattern
5
Second lightest element
8
Biological catalyst
9
Tectonic landmass section
10
Absolute temperature scale unit
11
Glass that splits light into spectrum
Down
2
Blocking of light by a celestial body
3
Reddish electrical conductor
6
Mass per unit volume
7
Preserved remains of ancient life
12
Group of similar cells
13
Element found in all living things
14
Substance with pH below 7