Across
1
The Red Planet
3
Reddish electrical conductor
4
Disturbance that transfers energy
5
Blocking of light by a celestial body
6
Hottest planet in solar system
11
Naturally occurring inorganic solid
Down
2
Biological catalyst
3
Element found in all living things
7
Unit of electric potential
8
Gas form of a liquid
9
Curved glass that refracts light
10
Path of a planet around the sun
12
Substance with pH below 7
13
Substance with pH above 7