Across
1
Second lightest element
5
Curved glass that refracts light
6
Tissue that contracts for movement
10
Force that attracts objects together
11
Fourth state of matter
Down
2
Magnetic metallic element
3
Molten rock beneath Earth surface
4
Absolute temperature scale unit
7
Biological catalyst
8
Preserved remains of ancient life
9
Unit of electric potential
12
Substance with pH below 7