1.
the first period in the Paleozoic era
2.
The Latin word for Wales
3.
There were no major ice sheets in this era
4.
Some of the first life to appear on earth
5.
The rapid appearance of life on earth.
6.
The era in which the Cambrian period is characterized.
7.
the man who named the Cambrian period
8.
The period following the Cambrian period.
9.
The factor that caused the burst of life
10.
The man who helped Adam discover the Cambrian period
