Across
1
Center of an atom or cell
4
Molten rock beneath Earth surface
6
Reddish electrical conductor
9
Solid with repeating atomic pattern
11
Fourth state of matter
13
Gas essential for breathing
14
Unit of power
Down
2
Element found in all living things
3
Preserved remains of ancient life
5
Icy body with a tail near the sun
7
Force that attracts objects together
8
Unit of energy
10
Ball of burning gas in space
12
Curved glass that refracts light