What are the two independent methods used in dating events in Earth's history?

The two independent methods used in dating events in Earth's history are relative dating and absolute dating. Relative dating involves determining the sequence of events and the relative age of rock layers or fossils based on their position in the geological record, using principles such as stratigraphy and the law of superposition. Absolute dating, on the other hand, provides a specific age or range in years for a rock or fossil, often through radiometric dating techniques that measure the decay of isotopes. Together, these methods help construct a comprehensive timeline of Earth's geological history.