Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.The module is an integrated unit which addresses the following National Science Education Standards: *Science as Inquiry: Students develop the abilities necessary to do scientific inquiry identify questions, design and conduct scientific investigations, use appropriate tools and technologies to gather, analyze and interpret data, think critically and logically to make the relationships between evidence and explanations, communicate results, and use mathematics in all aspects of scientific inquiry.*Life Science: Fossils indicate that many organisms that lived long ago are extinct.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.Relative dating helps determine what came first and what followed, but doesn't help determine actual age.
INTRODUCTION Scientists have good evidence that the earth is very old, approximately four and one-half billion years old.On a larger scale, even between continents, fossil evidence can help in correlating rock layers.The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.Continue Reading Relative dating observes the placement of fossils and rock in layers known as strata.
Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.
Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.