Earth 150 Million Years Ago - 搜索视频

Over 500 million years ago, weird complex creatures emerged on Earth. Scientists now think they know why

Over 500 million years ago, weird complex creatures emerged on Earth. Scientists now think they know why

(CNN) — Earth’s magnetic field plays a key role in making our planet habitable. The protective bubble over the atmosphere shields the planet from solar radiation, winds, cosmic rays and wild swings in temperature.

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