Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.
In this activity, students begin a sequencing activity with familiar items letters written on cards.
In reading earth history, these layers would be "read" from bottom to top or oldest to most recent.
If certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata.
Scientists measure the proportion of carbon-14 left in the organism to determine its age.
PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.
The complete "Paleontology and Dinosaurs" module takes approximately four weeks to teach. " activity is a 30-minute introduction to geologic time.