Across
1
Curved glass that refracts light
4
Element found in all living things
5
Force that attracts objects together
9
Amplified beam of light
11
Molten rock beneath Earth surface
12
Icy body with a tail near the sun
13
Magnetic metallic element
14
Substance with pH above 7
Down
2
Chemical element in table salt
3
Push or pull on an object
6
Center of an atom or cell
7
Ball of burning gas in space
8
Disturbance that transfers energy
10
Second lightest element