What is Earth's geologic history?
How has the diversity of life on Earth changed over time?
The rock strata (layers) record major historical events in Earth's history. These layers collectively make-up the geologic time scale or fossil record and document the existence, diversity, extinction, and evolution of organisms. These changes are driven by varying geological and environmental conditions.
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Explore each of the Geological Time Periods
"What was the Earth like?", "What organisms lived?", and "What fossils formed?"
"What was the Earth like?", "What organisms lived?", and "What fossils formed?"
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SEDIMENTARY ROCK FORMATION- Most fossils are formed in sedimentary rock
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