Across
1
Push or pull on an object
3
Mass per unit volume
5
Amplified beam of light
8
Unit of energy
9
Fourth state of matter
Down
2
Group of similar cells
4
Smallest unit of an element
6
Form of thermal energy
7
Reddish electrical conductor
10
Path of a planet around the sun
11
Molten rock beneath Earth surface
12
Substance with pH above 7
13
Hottest planet in solar system