Across
1
Smallest unit of an element
2
Form of thermal energy
4
Chemical element in table salt
5
Preserved remains of ancient life
7
Force that attracts objects together
10
Substance with pH above 7
Down
2
Second lightest element
3
Molten rock beneath Earth surface
6
Precious yellow metallic element
8
Our home planet
9
Curved glass that refracts light