Across
1
Biological catalyst
5
Form of thermal energy
6
Smallest unit of an element
9
Fourth state of matter
10
Gas form of a liquid
11
Path of a planet around the sun
Down
2
Substance with pH above 7
3
Amplified beam of light
4
Unit of force
7
Force that attracts objects together
8
Tissue that contracts for movement
12
Molten rock beneath Earth surface