Answer: James Hutton proposed the principle of Uniformitarianism.
James Hutton.
Step-by-step explanation: James Hutton was a renowned geologist, he gave the concept of Uniformitarianism. This concept links with the answer of first part of your question, the only difference is that this theory talks about changes that occurs within the Earth crust, whereas the answer of first part discussed the visible Earth features. This theory states that the changes in earth crust occurs due to some static and ongoing geological processes, which we discussed earlier. Earth's features which we can see along with those which occurs within the Earth crust are both the consequence of geological processes which gradually bring changes.