Across
1
Disturbance that transfers energy
4
Form of thermal energy
6
Blocking of light by a celestial body
8
Hottest planet in solar system
9
Compound containing oxygen
12
Positive particle in nucleus
Down
2
Biological catalyst
3
Tectonic landmass section
5
Force that attracts objects together
7
Curved glass that refracts light
10
Mass per unit volume
11
Precious yellow metallic element
13
Our home planet