横向
1
Disturbance that transfers energy
4
Magnetic metallic element
5
Second lightest element
6
Substance with pH below 7
9
Solid with repeating atomic pattern
10
Preserved remains of ancient life
12
Unit of power
纵向
2
Unit of force
3
Our home planet
7
Naturally occurring inorganic solid
8
Compound containing oxygen
11
Molten rock beneath Earth surface
13
Blocking of light by a celestial body
14
Hottest planet in solar system
15
Positive particle in nucleus