Across
1
Tectonic landmass section
3
Amplified beam of light
4
Mass per unit volume
6
Solid with repeating atomic pattern
8
Center of an atom or cell
9
Chemical element in table salt
11
Disturbance that transfers energy
Down
2
Blocking of light by a celestial body
3
Curved glass that refracts light
5
Fourth state of matter
7
Path of a planet around the sun
10
Substance with pH below 7
12
Measure of matter in an object
13
Force that attracts objects together