横向
1
Positive particle in nucleus
3
The Red Planet
6
Mass per unit volume
7
Substance with pH below 7
9
Compound containing oxygen
12
Tissue that contracts for movement
13
Magnetic metallic element
纵向
2
Chemical element in table salt
4
Push or pull on an object
5
Blocking of light by a celestial body
8
Element found in all living things
10
Gas essential for breathing
11
Ball of burning gas in space