Across
1
Naturally occurring inorganic solid
4
Chemical element in table salt
5
Ball of burning gas in space
6
Fourth state of matter
7
Gas essential for breathing
8
Smallest unit of an element
9
Substance with pH above 7
11
Precious yellow metallic element
Down
1
Molten rock beneath Earth surface
2
Push or pull on an object
3
Disturbance that transfers energy
10
Unit of energy