横向
1
Basic unit of life
4
Gas essential for breathing
6
Our home planet
7
Hottest planet in solar system
纵向
2
Substance with pH below 7
3
Preserved remains of ancient life
5
Substance with pH above 7
8
Tectonic landmass section
Basic unit of life
Gas essential for breathing
Our home planet
Hottest planet in solar system
Substance with pH below 7
Preserved remains of ancient life
Substance with pH above 7
Tectonic landmass section