Across
1
Hottest planet in solar system
4
Disturbance that transfers energy
6
Curved glass that refracts light
8
Preserved remains of ancient life
10
Molten rock beneath Earth surface
Down
2
Substance with pH above 7
3
Ball of burning gas in space
5
Nerve cell in the brain
7
Chemical element in table salt
9
Precious yellow metallic element