J. A. A. Grabau

J. A. A. Grabau was a prominent geologist who studied Earth's layers and fossils, helping us understand how continents and landforms have changed over millions of years. He proposed the idea of ancient land bridges connecting continents, which explained the distribution of plant and animal species across the world. His work contributed to the development of paleogeography—the study of historical land and sea arrangements—and enhanced our understanding of Earth's geological history and the processes shaping its surface. Grabau's research laid important groundwork for modern geology and plate tectonics.