The Principles of Geology (book by Charles Lyell)

*The Principles of Geology* by Charles Lyell argues that Earth's features change gradually over vast periods through natural processes like erosion, sedimentation, and volcanic activity. He emphasizes that these processes are still ongoing and responsible for shaping the landscape, challenging earlier ideas of rapid, divine interventions. By studying current geological changes, Lyell showed that Earth's history can be understood through observable natural laws, supporting the idea that the planet is much older than previously thought. His work laid the foundation for modern geology and provided crucial support for the theory of evolution by emphasizing Earth's deep, dynamic history.