横向
1
Center of an atom or cell
4
Molten rock beneath Earth surface
7
Compound containing oxygen
10
Particle of light
12
Infectious microscopic agent
纵向
2
Glass that splits light into spectrum
3
Second lightest element
5
Preserved remains of ancient life
6
Gas essential for breathing
8
Precious yellow metallic element
9
Measure of matter in an object
11
Reddish electrical conductor