Across
1
Chemical element in table salt
6
Preserved remains of ancient life
7
Form of thermal energy
8
Ball of burning gas in space
9
Solid with repeating atomic pattern
12
Nerve cell in the brain
13
Gas essential for breathing
14
Element found in all living things
Down
2
Path of a planet around the sun
3
Infectious microscopic agent
4
Mass per unit volume
5
Tissue that contracts for movement
10
Gas form of a liquid
11
Force that attracts objects together