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Clams and oysters; many living species. The complete "Paleontology and Dinosaurs" module takes approximately four weeks to teach. This is called relative dating.

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The "Who's On First? All of the fossils represented fossil and relative dating worksheet answers be found in sedimentary rocks of marine origin.

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Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. Extinction of species is common; most of the species that have lived on the earth no longer exist.

Three-lobed body; burrowing, crawling, and swimming forms; extinct NAME: The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.

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By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. The module is an integrated unit which addresses the following National Science Education Standards: 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.

On a larger scale, even between continents, fossil evidence can help in correlating rock layers. Teaching about Earth's history is a challenge for all teachers.

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When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils. Return to top The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century dating love songs propose that the rock layers could be correlated from place to place.

In reading earth history, these layers would be "read" from bottom to top or oldest to most recent.

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The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.

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These major concepts are part of the Denver Earth Science Project's "Paleontology and Dinosaurs" module written for students in grades