About 700 million years ago, Earth was entombed in a veneer of ice hundreds of feet thick—a frozen state scientists refer to ...
Our planet is unique for its ability to sustain abundant life. From studies of the rock record, scientists believe life had already emerged on Earth at least 3.5 billion years ago and probably much ...
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700 million years ago, our planet’s coldest ocean temperatures arrived during a mysterious era: Snowball Earth
Parts of the ocean reached temperatures of -15°C (5°F) without freezing 717-660 million years ago, geologists and geochemists ...
Evidence from fossil shells suggests that falling seawater calcium helped lock away carbon dioxide and helped cool Earth after the dinosaurs.
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