Across
1
Biological catalyst
3
The Red Planet
8
Solid with repeating atomic pattern
9
Element found in all living things
10
Smallest unit of an element
12
Gas form of a liquid
Down
2
Molten rock beneath Earth surface
4
Second lightest element
5
Amplified beam of light
6
Group of similar cells
7
Force that attracts objects together
11
Naturally occurring inorganic solid