Write a paragraph answering the following questions about the study of the Earth’s history based on the rock layers. 1. How can plate tectonics be used to explain the difference in ages among layers at a similar level but located in different parts of the ocean floor?
2.Why can the igneous intrusion not be dated by comparing it with the other layers, even though absolute age can be determined?
3.Because these geological processes have altered most of the early rock record of the Earth, which other evidences and analysis could be used to understand the Earth’s formation?