Across
1
Glass that splits light into spectrum
4
Substance with pH above 7
5
Compound containing oxygen
7
Second lightest element
8
Molten rock beneath Earth surface
10
Precious yellow metallic element
11
Push or pull on an object
Down
2
Smallest unit of an element
3
The Red Planet
6
Blocking of light by a celestial body
8
Tissue that contracts for movement
9
Path of a planet around the sun