Across
1
Form of thermal energy
4
Gas form of a liquid
5
Blocking of light by a celestial body
6
Substance with pH above 7
7
Natural satellite of Earth
Down
2
Icy body with a tail near the sun
3
Smallest unit of an element
4
Hottest planet in solar system
8
Basic unit of life
9
Molten rock beneath Earth surface
10
Unit of force
11
Amplified beam of light
12
Our home planet