Across
1
Center of an atom or cell
3
Push or pull on an object
4
Form of thermal energy
7
Path of a planet around the sun
8
Smallest unit of an element
9
Unit of heredity
Down
1
Nerve cell in the brain
2
Tectonic landmass section
5
Unit of electric potential
6
Blocking of light by a celestial body
10
Disturbance that transfers energy
11
Ball of burning gas in space