Across
1
Preserved remains of ancient life
5
Positive particle in nucleus
6
Blocking of light by a celestial body
7
Tectonic landmass section
8
Substance with pH below 7
12
Element found in all living things
Down
2
Unit of energy
3
Fourth state of matter
4
Solid with repeating atomic pattern
6
Biological catalyst
9
Infectious microscopic agent
10
Absolute temperature scale unit
11
Magnetic metallic element
13
Path of a planet around the sun