Across
1
Center of an atom or cell
2
Molten rock beneath Earth surface
5
Positive particle in nucleus
6
Solid with repeating atomic pattern
7
Second lightest element
10
Chemical element in table salt
Down
2
The Red Planet
3
Tissue that contracts for movement
4
Preserved remains of ancient life
7
Form of thermal energy
8
Force that attracts objects together
9
Unit of heredity
10
Ball of burning gas in space
11
Tectonic landmass section
12
Amplified beam of light