Across
1
Absolute temperature scale unit
4
Fourth state of matter
7
Measure of matter in an object
8
Unit of energy
10
Push or pull on an object
12
Substance with pH above 7
Down
2
Second lightest element
3
Gas essential for breathing
5
Basic unit of life
6
Ball of burning gas in space
9
Amplified beam of light
11
Unit of heredity