Download 4.4 Boundary Predictions pp - 7th-grade-science

Bellringer
• Iceland is a large island in the
Atlantic ocean. Iceland is
part of the mid-ocean ridge
and contains many
volcanoes. What type of
boundary created Iceland?
Agenda
• 1. Anticipatory Set
• 2. Input – Notes on divergent boudaries
• 3. Modeling – how to answer complex
questions
• 4. Guided Practice – team work
• 5. Independent Practice
• 6. Early finishers – models
• 7. Closing
Objective
• After today, you will be able to predict the
effects of divergent boundaries based on crust
type. You will also be able to answer
questions on all types of boundaries.
Big Goal Connection
• 80% Mastery
4.4 Boundary Predictions
Continental and Continental
• When two continental plates
diverge they form a rift
valley.
Oceanic and
Oceanic
When two oceanic plates
diverge they form a
midocean ridge.
Transform Boundary
• When two plates of any type lie
along a transform boundary, they
rub against each other causing
shearing, fault lines, and
earthquakes.
Let’s Practice…
• 1. What is the effect of two
continental plates diverging?
• 2. What is the effect of two
oceanic plates diverging?
• 3. What are the effects of a
transform boundary?
Modeling
Which of these describes a convergent boundary?
a) Two continental plates colliding, forming a
midocean ridge
b)Two continental plates rubbing against each
other, causing earthquakes
c) Two continental plates moving away from each
other, forming a rift valley
d)An oceanic plate subducting under a continental
plate, forming a volcanic arc
GP1
Which of these describes a transform boundary?
a) An oceanic plate subducting under another
oceanic plate, forming a trench
b)Two oceanic plates moving away from each other,
forming a midocean ridge
c) Two continental plates colliding, forming a
mountain range
d)Two continental plates rubbing against each
other, causing earthquakes
GP2
Which of these describes a convergent
boundary?
a) Two continental plates moving away from each
other, forming a rift valley
b) Two oceanic plates rubbing against each other,
forming a midocean ridge
c) Two continental plates colliding, forming a
mountain range
d) Two oceanic plates moving away from each
other, forming a volcanic arc
Modeling
• Lake Tanganyika, located in Eastern Africa, is
located in a rift valley. It is the largest rift lake in
Africa and the second largest lake by surface area
on the continent. What type of plate interaction
could have created Lake Tanganyika?
a)
b)
c)
d)
Subduction
Convergent plates
Divergent plates
Transverse plates
GP3
• The Red Sea is a narrow sea between the African
and Arabian plates. The Red Sea was created
when these continental plates moved away from
each other creating a large rift valley. What type
of plate boundary could have created the Red
Sea?
a)
b)
c)
d)
Convergent boundary
Divergent boundary
Transform boundary
Earthquakes
Modeling
• The Alpine fault forms the boundary between the
Australian and Pacific plates, along which the two
plates slide horizontally past each other.
Scientists classify the Alpine fault as a transform
fault. What is one of the most common effects of
a transform fault?
a)
b)
c)
d)
Volcanic eruptions
Tornadoes
Earthquakes
Seafloor spreading
GP4
The Cascades lie on the boundary between the
North American and Juan de Fuca Plate. The Juan
de Fuca Plate subuducted under the North
American Plate. What is one of the most common
effects of subduction of an oceanic plate under a
continental plate?
a) A volcanic mountain range
b)A rift valley
c) A midocean ridge
d)Volcanic islands
Modeling
Two plates composed of rock of different densities meet
along a convergent boundary. Which statement
describes what will happen where the two plates
meet?
a) The plates will collide, and the compression will heat the
plates, causing some of the plates to melt and form a rift
valley.
b) The plates will converge, causing one plate to subduct
underneath the other plate and forming a deep trench
along the boundary.
c) The plates will rub against each other, causing shearing
and creating fault lines in the interior of the plates.
d) The plates will collide with neither plate subducting,
causing the crust to pile up and form a mountain range.
GP5
Two plates composed of rock of similar density lie along a
transform boundary. Which statement describes what will
happen where the two plates meet?
a) The plates will rub against each other, causing shearing and
creating fault lines in the interior of the plates.
b) The plates will collide with neither plate subducting, causing
the crust to pile up and form a mountain range.
c) The plates will collide, and the compression will heat the
plates, causing some of the plates to melt and form volcanic
mountains.
d) The plates will rub against each other, causing one plate to
subduct underneath the other plate and forming a deep trench
along the boundary.
Modeling
Which of these describes the outcome of the
collision between oceanic and oceanic crust?
a) The two portions of crust will slide past one
another, side by side.
b) The two portions of the crust will collide and pile
up.
c) The two portions of crust will stop moving.
d) The denser oceanic crust will subduct beneath
the other oceanic crust.
GP6
Which of these describes the outcome of the
collision between oceanic and continental
crust? (DOK 2)
a) The two portions of crust will stop moving.
b) The continental crust will subduct beneath the
oceanic crust.
c) The two portions of crust will slide past one
another, side by side.
d) The oceanic crust will subduct beneath the
continental crust.
4.4 Independent Practice