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3-20 "Old Faithful"

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"Old Faithful"

  Did you know there are places on earth where boiling hot steam explodes out of a hole in the ground?  This is called a geyser.   In the state of Wyoming, there are at least two hundred geysers that shoot up out of the ground.  The most famous geyser shoots 11,000 gallons of water - boiling hot, so it's steam - 150 feet up.  For a very long time this geyser seemed to shoot up regularly, nearly once an hour.  That is how it got its name - "Old Faithful."

  A geyser occurs because beneath the earth's crust lies a thick layer of hot, melted rock.  This is called the mantle.  The deeper the mantle is, the hotter it gets.  At the center of the earth is a core of melted rock.  It gets as hot as 7,000 degrees.

  Sometimes holes open in the earth's crust.  When this happens, hot gas and liquid can escape from deep down in the earth.  This is why geysers occur.

 

Answer the questions below.

 

"Old Faithful" is located in the state of 

Washington.

Wyoming.

Arkansas.

 

A geyser is

a thick layer of hot, melted rock.

where boiling hot steam explodes out of a hole in the ground.

at the center of the earth.

 

The temperature at the center of the earth is degrees.

 

The deeper the mantle is the it gets.

 

"Old Faithful" shoots boiling steam feet up into the air.

 

Wyoming has at least two geysers.

 
The mantle of the earth is located 
beneath the earth's crust. 

at the center of the earth.

in a geyser. 

 
 "Old Faithful" got its name because

it shoots up regularly, nearly once an hour. 

it rarely shoots up.

it shoots up regularly, nearly once a month. 

 

 

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