Digital-Desert : Mojave Desert
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ecology: wildlife - plants - geography: regions - places - MAPS - roads & trails: route 66 - communities - old west - glossary - comments
ghost towns & gold mines - mining - parks & public lands: wilderness - history - native culture - military - geology: natural features -
Glossary of Terms & Definitions
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PRECAMBRIAN - The oldest and largest division of geologic time, between the consolidation of the earth's crust and the beginning of the Cambrian period; includes all time from the origins of the earth to about 600 million years ago; about 4 billion years in duration.




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ecology: wildlife - plants - geography: regions - places - MAPS - roads & trails: route 66 - communities - old west - glossary - comments
ghost towns & gold mines - mining - parks & public lands: wilderness - history - native culture - military - geology: natural features -
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