Across
1
Absolute temperature scale unit
4
Amplified beam of light
5
Unit of power
6
Preserved remains of ancient life
8
Smallest unit of an element
9
Molten rock beneath Earth surface
11
Our home planet
Down
2
Infectious microscopic agent
3
Substance with pH above 7
7
Fourth state of matter
10
Gas essential for breathing
12
Form of thermal energy