Across
1
Path of a planet around the sun
3
Reddish electrical conductor
4
Biological catalyst
5
Particle of light
8
Molten rock beneath Earth surface
10
Basic unit of life
11
Preserved remains of ancient life
Down
2
Naturally occurring inorganic solid
3
Solid with repeating atomic pattern
6
Magnetic metallic element
7
Gas essential for breathing
9
Compound containing oxygen