Learn English: The Time the Earth Became a Giant Iceball! (easy)
3 weeks ago
Imagine a long, long time ago, about 700 million years ago, the whole Earth froze over – even the warm places!
Big volcanoes erupted, sending lots of rocks everywhere, while plants hadn't even appeared yet.
The rocks changed the air and made it much colder, like a giant freezer turning on.
This made the Earth super cold and covered in ice for a very, very long time, a time called 'Snowball Earth'!
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