The Ghost Lake -- The True Story of Louis Agassiz

Louis Agassiz convinced a reluctant scientific world that glaciers moved. A great Ice Age had once wrapped much of the world in a shroud of ice. He also discovered that, when melted, the ice left behind the Great Lakes.
Even when he was young, Louis Agassiz was fascinated by the world of nature. All creatures interested him. As he grew older, Louis learned all he could about animals and plants. He found fossils especially fascinating. He soon became well-known for his great knowledge of science.
He lived an exciting life. He began difficult scientific explorations. He climbed mountains, organized expeditions into unexplored areas, and had himself lowered into the heart of a glacier through a great crack in the ice.
His great knowledge of nature earned him the title of Nature's Librarian.