Across
1
Solid with repeating atomic pattern
4
Amplified beam of light
7
Gas form of a liquid
8
Natural satellite of Earth
9
Center of an atom or cell
10
Hottest planet in solar system
13
Tectonic landmass section
Down
2
Second lightest element
3
Mass per unit volume
5
Disturbance that transfers energy
6
Blocking of light by a celestial body
11
Gas essential for breathing
12
Positive particle in nucleus