Across
1
Naturally occurring inorganic solid
5
Disturbance that transfers energy
6
Center of an atom or cell
8
Path of a planet around the sun
11
Amplified beam of light
12
Force that attracts objects together
Down
2
Our home planet
3
Substance with pH below 7
4
Curved glass that refracts light
7
Biological catalyst
9
Infectious microscopic agent
10
Push or pull on an object