横向
1
Positive particle in nucleus
3
Unit of power
4
Group of similar cells
6
Tissue that contracts for movement
7
Molten rock beneath Earth surface
8
Our home planet
9
Ball of burning gas in space
10
Biological catalyst
11
Blocking of light by a celestial body
纵向
1
Particle of light
2
Mass per unit volume
5
Substance with pH below 7
6
Naturally occurring inorganic solid
12
Smallest unit of an element
13
Magnetic metallic element