Apparently, ice did once cover the equator. A new study released on March 2010 gave some impressive evidence for the “snowball Earth” theory, that states that hundreds of millions of years ago, the Earth went through a terrible ice age that even allowed glaciers to form at the equator. I don’t know if icebergs were a part of the study (they’re different from glaciers, in that they are bodies of ice out in the ocean), but there is compelling evidence for what is now called the “Sturtian glaciation”, which lasted at least five million years.
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