Across
1
Our home planet
4
Curved glass that refracts light
6
Amplified beam of light
8
Gas form of a liquid
10
Chemical element in table salt
Down
2
Substance with pH below 7
3
Form of thermal energy
5
The Red Planet
7
Solid with repeating atomic pattern
9
Unit of force
11
Gas essential for breathing
12
Center of an atom or cell
13
Tectonic landmass section