Across
1
Second lightest element
3
The Red Planet
4
Solid with repeating atomic pattern
6
Push or pull on an object
7
Unit of heredity
9
Tissue that contracts for movement
11
Group of similar cells
Down
2
Molten rock beneath Earth surface
4
Element found in all living things
5
Center of an atom or cell
8
Biological catalyst
10
Unit of force