Across
1
Unit of electric potential
3
Curved glass that refracts light
4
Absolute temperature scale unit
6
Push or pull on an object
8
Naturally occurring inorganic solid
9
Group of similar cells
11
Natural satellite of Earth
Down
2
Blocking of light by a celestial body
5
Center of an atom or cell
7
Preserved remains of ancient life
10
Unit of force
12
Force that attracts objects together