In his book, "principles of geology," charles lyell explained that ongoing geological changes are responsible for changing the earth. what scientist was most directly influenced by lyell's observations?

Charles Darwin

Sir Charles Lyell was a renowned geologist of the mid 19th. Century. He was a firm believer in UNIFORMITARISM. this philosophy claims that geological, and biological "causes", or forces, have always been working in the same way and with  the same intensity. Lyell's work formed the foundation of belief in a universe billions of years old. Though Lyell had trouble accepting some evolutionary theories, his work heavily influenced Charles Darwin. In fact, Darwin's concept of gradual evolution lacked an acceptable time frame until he embraced Lyell's old-earth theories.

Charles Lyell, and Charles Darwin shared a support for uniformitarianism. This conflicted with the then prevailing theory of Catastrophism. the belief that the Universe, and earth, experienced major changes only as a result of major, rapid, catastrophic events. Scientist at the time saw no hard evidence that the earth was old enough to experience large - scale changes in any other way

Hope this helps

Charles Darwin. I took the quiz and that was the answer.