What was Charles Lyell main idea?

Answer 1

Charles Lyell's main idea was the concept of uniformitarianism, which suggests that the same geological processes we see occurring today have been shaping the Earth's surface over vast periods of time. This idea challenged the prevailing view of catastrophism, which proposed that the Earth's features were mainly the result of sudden and short-lived events. Lyell's work laid the foundation for modern geology and the understanding of long-term geological processes.