Adventures in paleontology: 36 classroom fossil activities by Thor Hansen, Irwin Slesnick

By Thor Hansen, Irwin Slesnick

Thousands of years after vanishing from the Earth, dinosaurs nonetheless have the facility to stir students’ interest. Deepen that curiosity with Adventures in Paleontology, a sequence of full of life hands-on actions specifically for heart schoolers. This superbly illustrated complete colour publication gains 36 actions that open scholars as much as various foundational sciences, together with biology, geology, chemistry, physics, and astronomy. for instance: • “How Do Fossils Form?” discusses how organisms develop into fossils and illustrates the concept that with actions that simulate fossil-making methods. • “What are you able to study From Fossils?” explores what fossils educate approximately historical organisms. • “Mass Extinction and Meteor Collisions With Earth” discusses lately came across hyperlinks among meteor and asteroid affects in the world and the death of animals like dinosaurs. different chapters disguise find out how to inform the age of the Earth; how dinosaurs advanced; and variety, category, and taxonomy.! the ultimate chapters provide humanistic views on fossils in literature and artwork. As an attention grabbing supplement to the textual content, bright complete colour illustrations exhibit not only skeletons and animal tracks but in addition what dinosaurs most likely appeared like of their common settings. convenient line drawings consultant scholars via every one step of the actions.

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The surface areas of the plates were the same for all three models. They heated the models to the same temperature, put them in a wind tunnel and then measured how fast each of them radiated heat. The third model, with the plates in two staggered rows, radiated heat the fastest. This further supports the hypothesis that the plates were used for thermoregulation. But we still can’t definitively state the purpose of the Stegosaurus plates. While Stegosaurus is the only member of an entire group of armored dinosaurs with flat plates in two rows, it is difficult to imagine it had a unique metabolism from all its relatives.

As millions of years passed, more layers of sediment accumulated on top of the dinosaur skeleton. Bacteria and fungi cleaned out the meat. Silicon-rich volcanic ash and lava eventually covered the overlying sediments. The open spaces in the bones filled with a form of agate called red jasper. Later much of the original bone dissolved and was replaced by other forms of silicates or calcite. As time passed these petrified bones of the dinosaur were compressed, heated, and deformed by the movement of moving plates.

Can we distinguish between these two hypotheses? Let’s look at the arrangement of the plates. They occur in two rows down the back in a staggered or offset pattern. , they could occur in a single row or in two rows without overlap. However the arrangement may be important if the plates serve as heat collectors or radiators. Some scientists did an experiment in which they made metal models to simulate three different plate arrangements. One model had a single long fin running down the back, the second model had two rows of plates arranged directly opposite each other, and the third model had two rows of plates arranged in a staggered or offset pattern as in Stegosaurus.

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