Across
1
The Red Planet
3
Substance with pH below 7
4
Solid with repeating atomic pattern
5
Molten rock beneath Earth surface
6
Unit of heredity
10
Infectious microscopic agent
Down
2
Force that attracts objects together
6
Precious yellow metallic element
7
Disturbance that transfers energy
8
Center of an atom or cell
9
Tissue that contracts for movement