Across
1
Glass that splits light into spectrum
3
Naturally occurring inorganic solid
4
Positive particle in nucleus
5
Gas essential for breathing
7
Basic unit of life
13
Push or pull on an object
14
Precious yellow metallic element
Down
2
Nerve cell in the brain
3
Tissue that contracts for movement
6
Solid with repeating atomic pattern
8
Our home planet
9
Preserved remains of ancient life
10
Molten rock beneath Earth surface
11
Force that attracts objects together
12
Fourth state of matter