Across
1
Positive particle in nucleus
4
Blocking of light by a celestial body
6
Form of thermal energy
7
Chemical element in table salt
9
Biological catalyst
10
Basic unit of life
11
Gas form of a liquid
Down
1
Particle of light
2
Curved glass that refracts light
3
Icy body with a tail near the sun
5
Tissue that contracts for movement
8
Disturbance that transfers energy
12
Absolute temperature scale unit
13
Path of a planet around the sun
14
Unit of electric potential