Across
1
Molten rock beneath Earth surface
3
Hottest planet in solar system
5
Preserved remains of ancient life
7
Precious yellow metallic element
10
Basic unit of life
Down
2
Unit of heredity
4
Glass that splits light into spectrum
6
Compound containing oxygen
8
Magnetic metallic element
9
Fourth state of matter
11
Curved glass that refracts light
12
Chemical element in table salt