Across
1
Substance with pH below 7
3
Glass that splits light into spectrum
4
Force that attracts objects together
5
Mass per unit volume
8
Second lightest element
10
Icy body with a tail near the sun
Down
2
Tissue that contracts for movement
4
Precious yellow metallic element
6
Center of an atom or cell
7
Solid with repeating atomic pattern
9
Ball of burning gas in space
11
Magnetic metallic element