fossils
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FossilsKelly Rodríguez
Listening and speaking VUniversidad de Nariñ0
March 2014San Juan de Pasto
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VocabularyAmber: 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.
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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.
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Definition
Fossils are
traces of animals that live in the past.
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Types of fossils
1. Body fossils: are the remains of the organisms.
Examples:
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Footprints Burrows
2. Trace fossils : signs of animals.
Examples:
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Fossilization processes
1. Natural mold.
2. Petrified wood.
3. Amber.4. Carbonizatio
n.5. Frozen fossil.
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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.
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Facts about fossilsWhat 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.
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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.