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Fossils
 

Fossils

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    Fossils Fossils Presentation Transcript

    • Kelly Rodríguez Listening and speaking V Universidad de Nariñ0 March 2014 San Juan de Pasto
    • Vocabulary Amber: yellow fossil resin.  Bury: to place something in the earth and cover with soil.  Burrow: an excavation in the ground made by an animal such as: a rabbit, a fox.  Compress: to reduce the size by pressing.  Date: to find out the time of an event.  Evolve: to develop gradually. Fake: not authentic.  Footprint: an impression made by a foot of a person or animal. Harden: to become harder.
    • Jawbone: the bone of the lower jaw.  Mold: a container that gives shape to a substance.  Rot: to decompose by the action of bacteria or fungi.  Seabed: the floor of the sea.  Seep: to filtrate through pores.  Skull: the skeletal part of the head which protects the brain.  Smear: to spread a substance over a surface.  Subsoil: the layer that is under the top soil.  Trap: to catch an animal in a trap.  Trace: an evidence.
    • Definition Fossils are traces of animals that live in the past.
    • Types of fossils 1. Body fossils: are the remains of the organisms. Examples:
    • BonesHairTeethShellsLeaves
    • Footprints Burrows 2. Trace fossils : signs of animals. Examples:
    • Fossilization processes 1. Natural mold. 2. Petrified wood. 3. Amber. 4. Carbonization. 5. Frozen fossil.
    • Steps of fossilization process 1. An animal dies. Ex: a fish. 2. The fish goes to the seabed. 3. Mud and other sediments bury the body in the deeper of the ocean. 4. Turns to fossil: takes million of years and the fossil will appear on the surface of soil.
    • Facts about fossils What are index fossils? They are used to identify geologic periods. What was Piltdown man? Piltdown man was a fake. The skull was human and the jawbone came from an orangutan.
    • Scientific importance 1. Identifying geologic periods. 2. Dating rocks. 3. It’s possible to know how the living beings have evolved. 4. Determining environmental conditions.