横向
1
Unit of electric potential
4
Molten rock beneath Earth surface
5
Chemical element in table salt
7
Particle of light
9
Preserved remains of ancient life
10
Tectonic landmass section
12
Disturbance that transfers energy
纵向
2
Force that attracts objects together
3
Mass per unit volume
6
Group of similar cells
8
Substance with pH above 7
11
Biological catalyst