Dinosaurs: Back from the Grave Stephanie Baumgart [email protected].
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Transcript of Dinosaurs: Back from the Grave Stephanie Baumgart [email protected].
Dinosaurs: Back from the Grave
Stephanie [email protected]
Rock Cycle
• 3 types of rock:• Igneous
• volcanic rock• Sedimentary
• compacted rock• Metamorphic
• deformed, changing rock
Journey to the Center of the Earth• Just over 4000 miles to the
center of the earth:• Crust
• 5-25 miles thick • Mantle
• 1800 miles thick • Solid rock – hotter rock moves
towards the surface, cooler rock sinks towards the core
• Outer Core• 1400 miles thick • Liquid iron, flows around• Generates magnetic field
• Inner Core• 800 miles thick • Solid iron, very hot (4700o C)
Plate Tectonics – The Land Moves!• The ground you’re
sitting on is moving about 1.15 cm per year
• Pangea• supercontinent 300
million years ago• Land masses join and
split and join again• Next supercontinent
in 250 million years
Fossilization: How do you become a fossil?
• Go die in the water – a calm riverbend or out in the deep sea are your best options• Eventually, your soft tissue will deteriorate and you will be buried by sediment as the water flows
by• As time goes by, the sediment will solidify and turn to rock, minerals in the sediment will turn your
bones into rocks, more layers will cover you over the course of millions of years• The earth shifts, uncovers a couple of your bones, and someone may find you
Ornithischia
Marginocephalians• Frilled dinosaurs• Ex: Protoceratops, Triceratops
Ornithopods• Bird-like dinosaurs• Ex: Iguanodon, Pachycephalosaurus
Thyreophorans• Armored dinosaurs• Ex: Ankylosaurus, Stegosaurus• Bird-hipped dinosaurs
• Herbivores (Plant-eaters)• Spend most of their time
on four legs; when they run, they can run on two legs
SaurischiaSauropods• Long-necked dinosaurs• Largest animals to roam the earth• Four-legged• Ex: Apatosaurus, Brachiosaurus
Theropods• Mostly carnivores• Two-legged• A branch of theropods evolved into birds• Ex: Tyrannosaurus, Velociraptor
• Lizard-hipped dinosaurs