Across
1
Unit of force
5
Ball of burning gas in space
6
Disturbance that transfers energy
7
Force that attracts objects together
9
Preserved remains of ancient life
10
Hottest planet in solar system
11
Chemical element in table salt
14
Solid with repeating atomic pattern
Down
2
Form of thermal energy
3
Center of an atom or cell
4
Mass per unit volume
8
Measure of matter in an object
12
Infectious microscopic agent
13
Naturally occurring inorganic solid