This lesson introduces absolute dating and a few ways in which scientists accomplish it.
The top of the heap of excavated dirt would date the oldest.
The most recently deposited materials are the youngest and are always at the top. It always applies except when some type of disturbance has occurred.
Strata in archaeological sites provide archaeologists with temporal and spatial information.
Discuss that the changes that have occurred on Earth including the terrain, temperature, landforms and organisms make it difficult to predict where dinosaurs may be found.
Ask: How has the GPS technology helped scientists to locate evidence of changing life forms?