Across
1
Positive particle in nucleus
5
Tissue that contracts for movement
6
Gas form of a liquid
7
Blocking of light by a celestial body
12
Our home planet
13
Hottest planet in solar system
Down
2
Push or pull on an object
3
Form of thermal energy
4
Unit of force
8
Group of similar cells
9
Mass per unit volume
10
Icy body with a tail near the sun
11
Tectonic landmass section