From YouTube, produced by National Geographic
Explore the science and beauty of these natural features. Video gives history that the Earth was once an icy ball others believe Earth was cold, but not quite ice. 700 million years ago the Earth was much colder. Volcanoes warmed the surface of the Earth, video shows a volcano that erupted in 2004 where a volcano was filmed erupting through an ice sheet in Central Iceland, this is what would have happened millions of years ago but on a global level. What saved the planet were the tons of carbon dioxide gas. As volcanoes erupted more and more carbon dioxide was released. The layer of carbon dioxide built up and trapped enough heat to end the endless winter. A thaw began and Earth would never be the same. Video is very interesting and is very good quality. Good for elementary grade and middle school students.