Here's why:
* Relative dating relies on the order of events: It establishes the sequence in which events happened (e.g., rock layer A is older than rock layer B) but doesn't provide a specific numerical age.
* It uses principles like superposition: The oldest rock layers are found at the bottom, while the youngest are at the top. Other principles include cross-cutting relationships, inclusions, and fossil succession.
* It's based on observations and comparisons: Geologists use these principles to determine the relative age of rocks, fossils, and geological features.
To get numerical ages, geologists need absolute dating methods: These methods use radioactive decay to determine the actual age of rocks and fossils in years.
In summary:
* Relative dating: Tells the order of events, but not the exact age.
* Absolute dating: Provides numerical ages, but requires specialized techniques and samples.
Both methods are essential in understanding Earth's history, but they serve different purposes.
