fossils

FossilsKelly Rodríguez

Listening and speaking VUniversidad de Nariñ0

March 2014San Juan de Pasto

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.

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:

Bones Hair Teeth Shells Leaves

Footprints Burrows

2. Trace fossils : signs of animals.

Examples:

Fossilization processes

1. Natural mold.

2. Petrified wood.

3. Amber.4. Carbonizatio

n.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 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.

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.