Across
1
Smallest unit of an element
4
Form of thermal energy
5
Hottest planet in solar system
6
Glass that splits light into spectrum
8
Tectonic landmass section
9
Reddish electrical conductor
Down
2
Measure of matter in an object
3
Unit of energy
5
Gas form of a liquid
7
Curved glass that refracts light
9
Icy body with a tail near the sun