Across
1
Group of similar cells
4
Magnetic metallic element
5
Reddish electrical conductor
7
Fourth state of matter
9
Push or pull on an object
12
Disturbance that transfers energy
13
Chemical element in table salt
15
Precious yellow metallic element
Down
2
Amplified beam of light
3
Blocking of light by a celestial body
6
Substance with pH below 7
8
Smallest unit of an element
10
Basic unit of life
11
Unit of energy
14
Compound containing oxygen