Across
1
Compound containing oxygen
4
Measure of matter in an object
6
Particle of light
8
Unit of heredity
Down
2
Second lightest element
3
Push or pull on an object
5
Curved glass that refracts light
7
Substance with pH below 7
9
Our home planet
Compound containing oxygen
Measure of matter in an object
Particle of light
Unit of heredity
Second lightest element
Push or pull on an object
Curved glass that refracts light
Substance with pH below 7
Our home planet