Scientists settled the nature of Earth’s ice age rhythm a century ago. Orbital cycles – Earth’s wobble in its path around the sun – drive cold spells and thaws on a reliable schedule. For most of the last few million years, that held.
About a million years ago, however, ice ages broke from that schedule. They grew longer and harsher, beyond what orbital cycles predict. A new study traces the break to a piece of Arctic seafloor that glaciers had not yet carved open.
Ice age…
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Source www.earth.com
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