Across
1
Measure of matter in an object
3
Hottest planet in solar system
4
Positive particle in nucleus
5
Nerve cell in the brain
6
Unit of electric potential
9
Blocking of light by a celestial body
10
Gas form of a liquid
Down
1
Naturally occurring inorganic solid
2
Center of an atom or cell
7
Disturbance that transfers energy
8
Curved glass that refracts light