Across
1
Positive particle in nucleus
4
Blocking of light by a celestial body
6
Molten rock beneath Earth surface
7
Reddish electrical conductor
8
Solid with repeating atomic pattern
12
Measure of matter in an object
Down
1
Tectonic landmass section
2
Amplified beam of light
3
Mass per unit volume
5
Curved glass that refracts light
9
Second lightest element
10
Infectious microscopic agent
11
The Red Planet
13
Basic unit of life