Across
1
Form of thermal energy
3
Hottest planet in solar system
5
Precious yellow metallic element
7
Biological catalyst
10
Ball of burning gas in space
11
Absolute temperature scale unit
Down
2
Our home planet
4
Substance with pH below 7
6
Unit of energy
8
Curved glass that refracts light
9
Measure of matter in an object
12
Icy body with a tail near the sun
13
Unit of electric potential