It all began around 4.6 billion years ago. It may have started earlier than that , but for now that is what we know as the beginning of Earth because age of the oldest rock on Earth. The Earth has gone through a lot since them. The only record from back then comes from rocks and fossils. In this unit we will be looking at how we determine the age of rocks as well as what existed during those times. Each time period has its own unique structure and its own unique purpose in how life is today.
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