横向
1
Reddish electrical conductor
3
Molten rock beneath Earth surface
4
Mass per unit volume
7
Ball of burning gas in space
8
Gas essential for breathing
9
Preserved remains of ancient life
10
Chemical element in table salt
纵向
2
Second lightest element
5
Blocking of light by a celestial body
6
Tissue that contracts for movement
11
Nerve cell in the brain
12
Substance with pH below 7