Across
1
Chemical element in table salt
3
Icy body with a tail near the sun
4
Positive particle in nucleus
7
Substance with pH above 7
10
Curved glass that refracts light
11
Our home planet
Down
1
Ball of burning gas in space
2
Natural satellite of Earth
5
Glass that splits light into spectrum
6
Tissue that contracts for movement
8
Precious yellow metallic element
9
Compound containing oxygen