Across
1
Push or pull on an object
4
Ball of burning gas in space
5
Unit of electric potential
6
Infectious microscopic agent
7
Group of similar cells
9
Unit of force
10
Basic unit of life
11
Center of an atom or cell
12
Solid with repeating atomic pattern
Down
2
Smallest unit of an element
3
Mass per unit volume
5
Hottest planet in solar system
8
Our home planet