Across
1
Our home planet
3
Center of an atom or cell
5
Measure of matter in an object
6
Molten rock beneath Earth surface
Down
2
Compound containing oxygen
3
Unit of force
4
Substance with pH above 7
5
The Red Planet
7
Smallest unit of an element
Our home planet
Center of an atom or cell
Measure of matter in an object
Molten rock beneath Earth surface
Compound containing oxygen
Unit of force
Substance with pH above 7
The Red Planet
Smallest unit of an element