Across
1
Icy body with a tail near the sun
3
Group of similar cells
6
Reddish electrical conductor
7
Particle of light
8
Solid with repeating atomic pattern
Down
1
Basic unit of life
2
Our home planet
4
Path of a planet around the sun
5
Nerve cell in the brain
9
Substance with pH below 7
10
Tectonic landmass section
11
The Red Planet
12
Measure of matter in an object