横向
1
Preserved remains of ancient life
4
Particle of light
6
Tectonic landmass section
纵向
2
Second lightest element
3
Unit of electric potential
5
Chemical element in table salt
6
Positive particle in nucleus
7
Smallest unit of an element
Preserved remains of ancient life
Particle of light
Tectonic landmass section
Second lightest element
Unit of electric potential
Chemical element in table salt
Positive particle in nucleus
Smallest unit of an element