Geologic Time Scale Crossword

The name of an extinction that happened during the Phanerozoic eon
This eon lasted from 542 million years ago to the present
The eon where the formation of Earth's core happened
The eon where the first sign of unicellular bacteria took place
During this eon, the "Snow Baller" took place
A major event that occurred during the Proterozoic eon
A length or portion of time
A major division of time that is a subdivision of an eon and is itself subdivided into periods
A major division of geological time, subdivided into eras
The beginning of a distinctive period in the history of someone or something
The name of an explosion that happened during the Phanerozoic eon
The relatively thin part of the earth's crust that underlies the ocean basins
A supposition or a system of ideas intended to explain something
The super continent that Scientist hypothesize that formed during the Proterozoic eon
Example: Pangaea, Gondwana, and Laurasia