Across
1
Icy body with a tail near the sun
3
Positive particle in nucleus
5
Infectious microscopic agent
6
Fourth state of matter
7
Biological catalyst
9
Tissue that contracts for movement
Down
2
Blocking of light by a celestial body
3
Tectonic landmass section
4
Group of similar cells
8
Natural satellite of Earth
10
Absolute temperature scale unit