横向
1
Molten rock beneath Earth surface
3
Mass per unit volume
6
Nerve cell in the brain
7
Reddish electrical conductor
纵向
2
Smallest unit of an element
4
The Red Planet
5
Magnetic metallic element
7
Solid with repeating atomic pattern
Molten rock beneath Earth surface
Mass per unit volume
Nerve cell in the brain
Reddish electrical conductor
Smallest unit of an element
The Red Planet
Magnetic metallic element
Solid with repeating atomic pattern