Across
1
Smallest unit of an element
4
Our home planet
5
Blocking of light by a celestial body
10
Hottest planet in solar system
11
Curved glass that refracts light
12
Gas form of a liquid
Down
2
Disturbance that transfers energy
3
Element found in all living things
6
Mass per unit volume
7
Unit of energy
8
Naturally occurring inorganic solid
9
Particle of light