There are many open questions about how our planet formed 4.55 billion years ago: When did plate tectonics start? When did the Earth's mantle begin to vigorously circulate in a process called ...
Ancient cave records reveal that repeated heavy rainfall and flooding, not drought, caused the decline of the Shijiahe culture in China.
Past civilizations have been significantly affected by climate change, but how they adapted to new conditions centuries ago ...
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