横向
1
Substance with pH below 7
3
Unit of force
4
Preserved remains of ancient life
5
The Red Planet
8
Smallest unit of an element
9
Our home planet
纵向
2
Magnetic metallic element
3
Center of an atom or cell
4
Push or pull on an object
6
Curved glass that refracts light
7
Molten rock beneath Earth surface