The Grand Canyon is a gigantic geological library, with rocky layers that tell much of the story of Earth’s history.
The Earth often gets a few visitors in the solar system, but some stick around for a while. Here's what to know about the ...
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6-million-year-old Antarctic ice reveals how Earth once heated; know what it warns about tomorrow
Scientists have discovered the oldest directly dated ice and air on Earth in East Antarctica, dating back six million years.
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