Volcanic Terms

1
Volcanic Terms

• A _________ is a region of high or special
  activity within a large area, in geology it
  refers to a location where lava flows out of the
  Earths mantle.

2
Volcanic Terms

• A hot spot is a region of high or special
  activity within a large area, in geology it
  refers to a location where lava flows out of the
  Earths mantle.

3
Volcanic Terms

• A popular way of classifying volcanoes is by
  their frequency of eruption.
• A volcano that has erupted in the past and may
  erupt again at some time in the distant future is
  called _______.
• A volcano that erupts regularly is called
  ________.
• A volcano that has not erupted in written history
  is considered to be ___________.

4
Volcanic Terms

• A popular way of classifying volcanoes is by
  their frequency of eruption.
• A volcano that has erupted in the past and may
  erupt again at some time in the distant future is
  called dormant.
• A volcano that erupts regularly is called
  ________.
• A volcano that has not erupted in written history
  is considered to be ___________.

5
Volcanic Terms

• A popular way of classifying volcanoes is by
  their frequency of eruption.
• A volcano that has erupted in the past and may
  erupt again at some time in the distant future is
  called dormant.
• A volcano that erupts regularly is called active.
• A volcano that has not erupted in written history
  is considered to be ___________.

6
Volcanic Terms

• A popular way of classifying volcanoes is by
  their frequency of eruption.
• A volcano that has erupted in the past and may
  erupt again at some time in the distant future is
  called dormant.
• A volcano that erupts regularly is called active.
• A volcano that has not erupted in written history
  is considered to be extinct.

7
Types of Volcanoes

• Shield Volcano
• Cinder Cone Volcano
• Composite Volcano

8
Shield Volcano

• Here is an example of a shield volcano.

9
Shield Volcano

• A shield volcano has a very _________, but is not
  very ______. It is composed primarily of
  ________.
• Their name derives from a translation of meaning
  "broad shield", from its resemblance to a
  warrior's shield.
• Shield volcanoes are built up over time by flow
  after flow from many ______ and __________ on the
  surface of the volcano.

10
Shield Volcano

• A shield volcano has a very large base, but is
  not very tall. It is composed primarily of lava.
  Shield volcanoes are formed by lava that flows
  slowly. The Hawaiian Islands are a classic
  example of a shield volcano.
• Their name derives from a translation of meaning
  "broad shield," from its resemblance to a
  warrior's shield.
• Shield volcanoes are built up over time by flow
  after flow from many _____ or _________ on the
  surface of the volcano.

11
Shield Volcano

• A shield volcano has a very large base, but is
  not very tall. It is composed primarily of lava.
  Shield volcanoes are formed by lava that flows
  slowly. The Hawaiian Islands are a classic
  example of a shield volcano.
• Their name derives from a translation of meaning
  "broad shield," from its resemblance to a
  warrior's shield.
• Shield volcanoes are built up over time by flow
  after flow from many vents or fissures on the
  surface of the volcano.

12
Cinder Cone Volcano
Here is an example of a cinder cone.
13
Cinder Cone Volcano

• A cinder cone is the second smallest of the
  volcanoes. They typically erupt once.
• Cinder cones are simple volcanoes which have a
  __________ crater at the summit and only grow to
  about a thousand feet, the size of a hill. They
  usually are created of eruptions from a _________
  opening, unlike a strato-volcano or shield
  volcano which can erupt from many different
  openings.
• During eruptions, blobs ("cinders") of lava,
  blown into the air, break into small fragments
  (pyroclastics) that fall around the opening to
  the volcano. The pile forms an oval-shaped small
  volcano, as shown in the previous picture.

14
Cinder Cone Volcano

• A cinder cone is the second smallest of the
  volcanoes. They typically erupt once.
• Cinder cones are simple volcanoes which have a
  bowl-shaped crater at the summit and only grow to
  about a thousand feet, the size of a hill. They
  usually are created of eruptions from a single
  opening, unlike a strato-volcano or shield
  volcano which can erupt from many different
  openings.
• During eruptions, blobs ("cinders") of lava,
  blown into the air, break into small fragments
  (pyroclastics) that fall around the opening to
  the volcano. The pile forms an oval-shaped small
  volcano, as shown in the previous picture.

15
Composite Volcano

• Here is an example of a Composite Volcano.

16
Composite Volcano

• This type of volcano is the largest and tallest
  of the volcanoes. It is also known as a
  Strato-Volcano.
• A composite is the classic example of a volcano.
  It is a tall ___________ mountain in which layers
  of lava alternate with layers of ash.
• Cinders and ash pile on top of each other, then
  lava flows on top and dries and then the process
  begins again.

17
Composite Volcano

• This type of volcano is the largest and tallest
  of the volcanoes. It is also known as a
  Strato-Volcano.
• A composite is the classic example of a volcano.
  It is a tall cone-shaped mountain in which layers
  of lava alternate with layers of ash.
• Cinders and ash pile on top of each other, then
  lava flows on top and dries and then the process
  begins again.