Across
1
Gas essential for breathing
4
Measure of matter in an object
5
Fourth state of matter
8
Our home planet
9
Glass that splits light into spectrum
12
Path of a planet around the sun
Down
2
Disturbance that transfers energy
3
Center of an atom or cell
6
Form of thermal energy
7
Unit of electric potential
10
Gas form of a liquid
11
Molten rock beneath Earth surface