Across
1
Biological catalyst
5
Smallest unit of an element
6
Tectonic landmass section
7
Our home planet
8
Path of a planet around the sun
11
Substance with pH above 7
Down
2
Second lightest element
3
Push or pull on an object
4
Tissue that contracts for movement
9
Center of an atom or cell
10
Molten rock beneath Earth surface