Across
1
Smallest unit of an element
3
Tectonic landmass section
4
Push or pull on an object
5
Biological catalyst
7
Substance with pH above 7
11
Unit of energy
Down
2
Disturbance that transfers energy
3
Particle of light
6
Hottest planet in solar system
8
Gas form of a liquid
9
Mass per unit volume
10
Naturally occurring inorganic solid