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4-3 Jacob's Dream

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Jacob's Dream

  Since he was as old as he could remember Jacob dreamed of becoming a paleontologist.  His interest was sparked at the age of three when he found what appeared to be just an ordinary stone in his neighbor's backyard.  That ordinary gray stone was instead a fossil.

  How did Jacob know it was a fossil?  His father had taken him to the library and this is how it all began.

  Today Jacob is giving a presentation to his science class about five types of fossils.  He explains that most fossils are found in sedimentary rock.  The class has studied the different types of rocks and know that sedimentary rock is made up of mud, sand, and decayed bits of plants and animals that settle to the bottom of oceans or lakes.  Jacob explains that fossils form within rock in several ways.  Dead animals and plants rot away and leave a hollow space in the rock.  The space is the same shape as the plant or animal that was once alive.  This he told the class is called a mold fossil.  If the mold fills with water, minerals from the water build up and form the shape of the animal or plant.  This is called cast fossil.  Petrified wood is another kind of fossil.  It is created when minerals slowly replace the cells of the dead plant or animal.  A rocklike fossil that looks very much like the live plant or animal is formed - petrified wood.  Trace fossils are just that, he explained to his classmates.  Footprints or trails of animals that have been preserved in rock.  The last kind of fossil he shared with his classmates was the true-form fossil.  The true-form fossil is created when the remains of animals, like bones, teeth, and shells are preserved.

  As Jacob finished his fossil presentation he found himself surrounded by eager and impatient classmates.  They all had questions for him about his interest in paleontology, the study of prehistoric life through fossils.

 

Answer the questions below.

 

Jacob explained how many different types of fossils to his classmates?

 

Jacob's interest in fossils began at the age of .

 

His classmates knew that rock is made up of mud, sand, and decayed bits of plants and animals.

 

wood is one type of fossil created when minerals slowly replace the cells of dead plants and animals.

 

A is a scientist who studies paleontology.

 

A - fossil is created when remains of animals such as teeth, bones, and shells are preserved.

 

The hollow space left in a rock by a decayed plant or animal is called a fossil.

 
Jacob's took him to the library to find out more about the stone he had found.
 
Jacob was giving a presentation to his class.
 
Jacob explained that a fossil is the footprint or trail left by an animal preserved in rock.

 

 

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