Across
1
Substance with pH above 7
3
Chemical element in table salt
5
Preserved remains of ancient life
8
Solid with repeating atomic pattern
11
Amplified beam of light
12
Biological catalyst
Down
2
Gas essential for breathing
4
Compound containing oxygen
6
Molten rock beneath Earth surface
7
Hottest planet in solar system
8
Reddish electrical conductor
9
Ball of burning gas in space
10
Basic unit of life
13
Curved glass that refracts light