Across
1
Curved glass that refracts light
3
Natural satellite of Earth
5
Compound containing oxygen
6
Amplified beam of light
11
Center of an atom or cell
Down
2
Gas essential for breathing
4
Preserved remains of ancient life
7
Measure of matter in an object
8
Path of a planet around the sun
9
Reddish electrical conductor
10
Glass that splits light into spectrum