Welcome the sights and sounds of the world with the Footprint Reading Library. This content based reading series presents fascinating real world stories in three formats print audio and video from National Geographic Digital Media. This series offers fascinating stories and facts from the four corners of our world and develop the language and skills needed to understand non fiction writing.The stories in these series are grouped into five themes Incredible Animals Fascinating Places Remarkable People Exciting Activities and Amazing Science.One hundred individual readers graded into eight levels from pre intermediate to advanced and ranging from 800 to 3000 headwords.Two scientists are traveling through Ethiopia to study a very old volcano. Volcanoes can be dangerous because they have hot melted rock inside. But they also offer important information. Will the scientists make it safely to the volcano What will they learn there