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DIVERGENCE OF PLATES
FAULT – Breaks in Earth’s crust where rocks have
slipped past each other.
The edges of Earth’s plates
meet at plate boundaries.
Extended deep into the
lithosphere
What are the three types of
boundaries?
• Divergent Boundaries
• Convergent Boundaries
• Transform Boundaries
Divergent Boundaries
A plate boundary where two plates move away from
each other.
 
RIFTING
causes
SEAFLOOR SPREADING
How is the rock pulled at Divergent
Boundaries?
Rock gets THIN in the middle as it is
pulled apart.
This STRESS is called
What happens when the rock SNAPS
from the Stress of Tension?
A Normal Fault (fault is a break in Earth’s
crust)
Rock drops down as it breaks
What happens next at Divergent Boundaries?
• A geologic feature or
event…
May form RIFT
VALLEYS on continents
SEA-FLOOR SPREADING
in the ocean
A rift valley is a linear shaped lowland
between several highlands or
mountain ranges created by the action
of a geologic rift or fault. A rift
valley is formed on a divergent plate
boundary, a crustal extension or
spreading apart of the surface, which
is subsequently further deepened by
the forces of erosion.
East African Valley
Rio Grande Rift East Valley, Taiwan
West Antarctic Rift
Oceanic ridges an elevated region
with a central valley on an ocean floor
at the boundary between two diverging
tectonic plates where new crust forms
from upwelling magma.
 a continous mass of land with long
width and height on the ocean floor
CREATED WHEN MAGMA
RISING BETWEEN DIVERGING
PLATES OF THE
LITHOSPHERE COOLS AND
FORMS A NEW LAYER OF
CRUST
The mid ocean ridge systems are the
largest geological features on the planet.
The Mid-Atlantic Ridge (MAR) is a mostly
underwater mountain range in the
Atlantic Ocean that runs from 87°N -
about 333km south of the North Pole- to
subantarctic Bourvet island at 54°S. The
MAR is about 3 km in height above the
ocean floor and 1000 to 1500 km wide,
has numerous transform faults and an
axial rift valley along its length.
The Mid-Atlantic Ridge is a submarine ridge
located along the floor of the Atlantic Ocean,
that wraps around the globe for more than
65,000 km like the seam of a baseball. It is the
longest and the most extensive chain of
mountains on earth, but being located
underwater, more than 90% of this mountain
range remains hidden from view. There are only
a few places on earth where it juts out of the
surface of the ocean, in the form of a few
islands, one of which is Iceland.
Features of Divergent Boundaries
• Mid-ocean ridges
• rift valleys
• fissure volcanoes
 Q28 What are common in the four pictures?
Answers: All four pictures show a fissure or a crack
between two land masses.
 Q29. What do you think is happening to the Earth’s
crust in those pictures? Answer: The land masses
are moving away from each other.
 Q30. If this event continues for millions of years,
what do you think will be the effect on the
crust? Answer: The distance between the land
masses will be far greater than what is
shown in the picture.
 Q31. Complete the drawing below to illustrate your
answer in question number 3.
KEY CONCEPTS
 1. Divergent boundaries occur along spreading centers
where plates are moving apart and new crust is created
by magma pushing up from the mantle.
 2. Effects that are found at a divergent boundary
between oceanic plates include: a submarine mountain
range such as the Mid-Atlantic Ridge; volcanic activity
in the form of fissure
eruptions;shallow earthquake
activity;creation of new seafloor; and
a widening ocean basin.
 3. If a divergent boundary is between continental
plates, the effects are: rift valley formation which will
soon develop into linear sea; shallow earthquake
activities, and numerous normal faults.

Fault-a break in a rock along which
movement has occured
TRANSFORM BOUNDARIES
• Occurs at divergent boundaries
• 2 plates slide past each other
• This sliding is not smooth. Plates
lock and build up tension.
• Then the plates “snap” and release
that energy  earthquake!
http://www.youtube.com/watch?NR=1&v=ZxPTLmg0ZCw&feature=ends
creen
TRANSFORM FAULT BOUNDARIES
 Activity 5
 Slide and Shake
 Objective
 - relate hotspot with plate tectonic
What causes the formation of this
chain of volcanic island?
Hotspot- A “hot spot” is an area in the
mantle from which hot materials rise
as a thermal plume
 Individual column of magma that rises
up and punches through the
lithosphere
 Forms chains of volcanoes as a plate
moves over the hot spot
 ~100 Hot Spots
 10% of heat transfer
 Decompression melting (like
divergence)
Mantle Plumes (Hotspots)
The tectonic plate moves over a
fixed hotspot forming a chain of
volcanoes.
The volcanoes get younger from one
end to the other.
Which mountain
Is oldest?
Hotspot volcanism: http://tinyurl.com/y6dyd6
The heat from the hotspot produces
a persistent source of magma by
partially melting the overriding plate,
which rises through the mantle to
erupt on the sea floor, forming an
active seamount.
PRACTICE WORKSHEET
As the plate moves, the island is
carried beyond the hot spot and its
magma source and volcanism
ceases. As that volcano becomes
extinct, another develops over the
hot spot and the cycle is repeated.
Thus a line of volcanoes is created
over millions of yrs ( but only the
plume above the hot spot is active,
the rest are extinct and may even
subside and sink below the ocean)
Where does the rock that makes up the Hawaiian
islands come from?
MAGMA!
Divergence of Plates.pptx
Divergence of Plates.pptx

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Divergence of Plates.pptx

  • 2. FAULT – Breaks in Earth’s crust where rocks have slipped past each other. The edges of Earth’s plates meet at plate boundaries. Extended deep into the lithosphere
  • 3. What are the three types of boundaries? • Divergent Boundaries • Convergent Boundaries • Transform Boundaries
  • 4. Divergent Boundaries A plate boundary where two plates move away from each other.   RIFTING causes SEAFLOOR SPREADING
  • 5. How is the rock pulled at Divergent Boundaries? Rock gets THIN in the middle as it is pulled apart. This STRESS is called
  • 6. What happens when the rock SNAPS from the Stress of Tension? A Normal Fault (fault is a break in Earth’s crust) Rock drops down as it breaks
  • 7. What happens next at Divergent Boundaries? • A geologic feature or event… May form RIFT VALLEYS on continents SEA-FLOOR SPREADING in the ocean
  • 8. A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. A rift valley is formed on a divergent plate boundary, a crustal extension or spreading apart of the surface, which is subsequently further deepened by the forces of erosion.
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  • 11. Rio Grande Rift East Valley, Taiwan
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  • 14. Oceanic ridges an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma.  a continous mass of land with long width and height on the ocean floor
  • 15. CREATED WHEN MAGMA RISING BETWEEN DIVERGING PLATES OF THE LITHOSPHERE COOLS AND FORMS A NEW LAYER OF CRUST
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  • 18. The mid ocean ridge systems are the largest geological features on the planet. The Mid-Atlantic Ridge (MAR) is a mostly underwater mountain range in the Atlantic Ocean that runs from 87°N - about 333km south of the North Pole- to subantarctic Bourvet island at 54°S. The MAR is about 3 km in height above the ocean floor and 1000 to 1500 km wide, has numerous transform faults and an axial rift valley along its length.
  • 19. The Mid-Atlantic Ridge is a submarine ridge located along the floor of the Atlantic Ocean, that wraps around the globe for more than 65,000 km like the seam of a baseball. It is the longest and the most extensive chain of mountains on earth, but being located underwater, more than 90% of this mountain range remains hidden from view. There are only a few places on earth where it juts out of the surface of the ocean, in the form of a few islands, one of which is Iceland.
  • 20.
  • 21. Features of Divergent Boundaries • Mid-ocean ridges • rift valleys • fissure volcanoes
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  • 23.  Q28 What are common in the four pictures? Answers: All four pictures show a fissure or a crack between two land masses.  Q29. What do you think is happening to the Earth’s crust in those pictures? Answer: The land masses are moving away from each other.  Q30. If this event continues for millions of years, what do you think will be the effect on the crust? Answer: The distance between the land masses will be far greater than what is shown in the picture.  Q31. Complete the drawing below to illustrate your answer in question number 3.
  • 24. KEY CONCEPTS  1. Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle.  2. Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions;shallow earthquake activity;creation of new seafloor; and a widening ocean basin.  3. If a divergent boundary is between continental plates, the effects are: rift valley formation which will soon develop into linear sea; shallow earthquake activities, and numerous normal faults. 
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  • 31. Fault-a break in a rock along which movement has occured
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  • 34. TRANSFORM BOUNDARIES • Occurs at divergent boundaries • 2 plates slide past each other • This sliding is not smooth. Plates lock and build up tension. • Then the plates “snap” and release that energy  earthquake! http://www.youtube.com/watch?NR=1&v=ZxPTLmg0ZCw&feature=ends creen
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  • 38. TRANSFORM FAULT BOUNDARIES  Activity 5  Slide and Shake  Objective  - relate hotspot with plate tectonic
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  • 44. What causes the formation of this chain of volcanic island?
  • 45. Hotspot- A “hot spot” is an area in the mantle from which hot materials rise as a thermal plume
  • 46.  Individual column of magma that rises up and punches through the lithosphere  Forms chains of volcanoes as a plate moves over the hot spot  ~100 Hot Spots  10% of heat transfer  Decompression melting (like divergence) Mantle Plumes (Hotspots)
  • 47.
  • 48. The tectonic plate moves over a fixed hotspot forming a chain of volcanoes. The volcanoes get younger from one end to the other.
  • 49. Which mountain Is oldest? Hotspot volcanism: http://tinyurl.com/y6dyd6
  • 50. The heat from the hotspot produces a persistent source of magma by partially melting the overriding plate, which rises through the mantle to erupt on the sea floor, forming an active seamount.
  • 52. As the plate moves, the island is carried beyond the hot spot and its magma source and volcanism ceases. As that volcano becomes extinct, another develops over the hot spot and the cycle is repeated. Thus a line of volcanoes is created over millions of yrs ( but only the plume above the hot spot is active, the rest are extinct and may even subside and sink below the ocean)
  • 53. Where does the rock that makes up the Hawaiian islands come from? MAGMA!