Geologic Time Activity Worksheet
Rocky Mountains are formed 80 million years First known fish 510 million years Paleozoic Era begins Earliest humans 2 million years Formation of the Earth 4.6 billion years First known mammal 200 million years Proterozoic Eon begins First single-celled organism 1.2 billion years 26.1 Columbus discovers America Oldest rock 3.8 billion years ... ................
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