Across
1
Center of an atom or cell
2
Unit of power
5
Compound containing oxygen
7
Magnetic metallic element
11
The Red Planet
Down
2
Disturbance that transfers energy
3
Element found in all living things
4
Substance with pH below 7
6
Precious yellow metallic element
8
Natural satellite of Earth
9
Blocking of light by a celestial body
10
Icy body with a tail near the sun
12
Form of thermal energy