Across
1
Center of an atom or cell
5
Compound containing oxygen
6
Naturally occurring inorganic solid
7
Form of thermal energy
Down
2
Natural satellite of Earth
3
Icy body with a tail near the sun
4
Disturbance that transfers energy
8
Unit of power
9
Infectious microscopic agent
10
Blocking of light by a celestial body
11
Element found in all living things