Across
1
Precious yellow metallic element
3
Unit of force
4
Naturally occurring inorganic solid
10
Substance with pH above 7
11
Unit of heredity
Down
2
Gas essential for breathing
5
Unit of power
6
Tectonic landmass section
7
Amplified beam of light
8
Our home planet
9
Form of thermal energy
12
Curved glass that refracts light