Across
1
Second lightest element
3
Natural satellite of Earth
4
Solid with repeating atomic pattern
5
Precious yellow metallic element
7
Force that attracts objects together
9
Substance with pH above 7
10
The Red Planet
Down
2
Molten rock beneath Earth surface
3
Naturally occurring inorganic solid
6
Gas essential for breathing
8
Tissue that contracts for movement
11
Unit of heredity
12
Magnetic metallic element