Ice can keep an amazing record of past climate on Earth. The problem is that we haven't found ice older that are reliably older than ~800,000 years. New research may push that number back to almost 5 million years.
Sampling ice in the Ong Valley of Antarctica in May 2018. Greg Balco, Grant Boeckman and Marie Bergelin operate the ice drill in the Ong Valley. Credit: Jaakko Putkonen, United States Antarctica ProgramMost of us think of ice as ephemeral. It forms when it is cold and melts away once it warms up . Yet, glaciers are evidence that ice can persist. The ice that forms glaciers takes centuries to form and may stick around for hundreds of thousands years ... and possibly much, much longer..
Glacial ice is as close to "rock" as water can get on Earth, forming an interlocking networking of ice crystals that can look like granite under a microscope. That glacial ice might have started as many feet
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