Across
1
Amplified beam of light
4
Push or pull on an object
5
Chemical element in table salt
8
Biological catalyst
10
Substance with pH below 7
12
Smallest unit of an element
Down
2
Reddish electrical conductor
3
Molten rock beneath Earth surface
6
Compound containing oxygen
7
Natural satellite of Earth
9
Basic unit of life
11
Tissue that contracts for movement
13
Disturbance that transfers energy