What is an ice age? An ice age is a long interval of time (millions to tens of millions of years) when global temperatures are relatively cold and large areas of the Earth are covered by continental ice sheets and alpine glaciers. Within an ice age are multiple shorter-term periods of warmer temperatures when glaciers retreat (called interglacial’s or interglacial cycles) and colder temperatures when glaciers advance (called glacial or glacial cycles).At least five major ice ages have occurred throughout Earth’s history: the earliest was over 2 billion years ago, and the most recent one began approximately 3 million years ago and continues today (yes, we live in an ice age!).Currently, we are in a warm interglacial that began about 11,000 years ago. The last period of glaciations, which is often informally called the “Ice Age,” peaked about 20,000 years ago. At that time, the world was on average probably about 10°F (5°C) colder than today, and locally as much as 40°F (22°C) colder. Scientists have reconstructed past ice ages by piecing together information derived from studying ice cores, deep sea sediments, fossils, and landforms. Ice and sediment cores reveal an impressive detailed history of global climate. Cores are collected by driving long hollow tubes as much as 2 miles deep into glacial ice or ocean floor sediments. Ice cores provide annual and even seasonal climate records for up to hundreds of thousands of years, complementing the millions of years of climate records in ocean sediment cores.
Ice Age is a series of animated films produced by Blue Sky Studios, a division of 20th Century Fox, and featuring the voices of Ray Romano, John Leguizamo, Denis Leary, and Chris Wedge. Four films have been released in the series thus far, Ice Age in 2002, Ice Age: The Meltdown in 2006, Ice Age: Dawn of the Dinosaurs in 2009 and Ice Age: Continental Drift in 2012. There have been many ice ages during the last 2.6 million years but when people talk about the Ice Age, they are often referring to the most recent glacial period, which peaked about 21,000 years ago and ended about 11,500 years ago. John Leguizamo. John Leguizamo, born in Bogotá, Colombia, is an actor. He voices the ground sloth Sid in the Ice Age series, and voices the character in the last few Ice Age video games.
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