Across
1
Molten rock beneath Earth surface
2
Glass that splits light into spectrum
3
Hottest planet in solar system
6
Path of a planet around the sun
8
Absolute temperature scale unit
9
Form of thermal energy
10
Ball of burning gas in space
Down
2
Fourth state of matter
4
Unit of force
5
Icy body with a tail near the sun
7
Measure of matter in an object