Across
1
Substance with pH above 7
3
Unit of electric potential
4
Icy body with a tail near the sun
7
Positive particle in nucleus
9
Absolute temperature scale unit
11
Magnetic metallic element
Down
2
Force that attracts objects together
4
Basic unit of life
5
Preserved remains of ancient life
6
Push or pull on an object
8
Gas essential for breathing
10
Fourth state of matter