Across
1
Amplified beam of light
4
Substance with pH above 7
5
Biological catalyst
6
Gas essential for breathing
11
Magnetic metallic element
Down
2
Icy body with a tail near the sun
3
Second lightest element
7
Curved glass that refracts light
8
Ball of burning gas in space
9
Tissue that contracts for movement
10
Precious yellow metallic element