Please choose the correct answer to the question: The surface of Earth is constantly changing. Which of these findings provides the best evidence that the crustal surface of Earth has changed over time?

Answer1: Some rock layers are very thick. Answer2: Some species have become extinct. Answer3: Marine fossils are found in mountain areas. Answer4: Igneous rock is found on all tectonic plates.

Answer format: answer1/answer2/answer3/answer4