Across
1
Unit of power
3
Second lightest element
4
Infectious microscopic agent
7
Amplified beam of light
8
Naturally occurring inorganic solid
11
Magnetic metallic element
12
Element found in all living things
Down
2
Mass per unit volume
5
Molten rock beneath Earth surface
6
Absolute temperature scale unit
9
Unit of force
10
Path of a planet around the sun
13
Fourth state of matter