横向
1
Biological catalyst
4
Unit of power
5
Curved glass that refracts light
6
Tectonic landmass section
7
Amplified beam of light
8
Substance with pH below 7
10
Nerve cell in the brain
12
Gas form of a liquid
13
Force that attracts objects together
纵向
2
Mass per unit volume
3
Group of similar cells
9
Naturally occurring inorganic solid
11
Molten rock beneath Earth surface