Across
1
Fourth state of matter
5
Compound containing oxygen
6
Our home planet
7
Curved glass that refracts light
Down
1
Positive particle in nucleus
2
Substance with pH below 7
3
Form of thermal energy
4
Basic unit of life
Fourth state of matter
Compound containing oxygen
Our home planet
Curved glass that refracts light
Positive particle in nucleus
Substance with pH below 7
Form of thermal energy
Basic unit of life