横向
1
Push or pull on an object
4
Naturally occurring inorganic solid
5
Hottest planet in solar system
6
Force that attracts objects together
11
Disturbance that transfers energy
12
Center of an atom or cell
15
Our home planet
纵向
2
Amplified beam of light
3
Mass per unit volume
7
Absolute temperature scale unit
8
Tectonic landmass section
9
Positive particle in nucleus
10
Molten rock beneath Earth surface
13
Ball of burning gas in space
14
Group of similar cells