Across
1
Disturbance that transfers energy
4
Compound containing oxygen
6
Gas form of a liquid
7
Push or pull on an object
8
Unit of force
10
Element found in all living things
Down
2
Naturally occurring inorganic solid
3
Blocking of light by a celestial body
5
Smallest unit of an element
9
Natural satellite of Earth
11
Group of similar cells
12
Nerve cell in the brain