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 ridgeb)Two continental plates rubbing against each

other, causing earthquakesc) Two continental plates moving away from each

other, forming a rift valleyd)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 trenchb)Two oceanic plates moving away from each

other, forming a midocean ridgec) Two continental plates colliding, forming a

mountain ranged)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 valleyb) Two oceanic plates rubbing against each other,

forming a midocean ridgec) Two continental plates colliding, forming a

mountain ranged) 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) Subductionb) Convergent platesc) Divergent platesd) 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) Convergent boundaryb) Divergent boundaryc) Transform boundaryd) 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) Volcanic eruptionsb) Tornadoesc) Earthquakesd) 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 valleyc) A midocean ridged)Volcanic islands

ModelingTwo 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.

GP5Two 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