Category: 1. Geophysical systems

Mechanisms of plate movement…

Mechanisms of plate movement…

Syllabus Point: To know the Mechanisms of plate movement including internal heating, convection currents, plumes, subduction and rifting at plate margins

Starter: Task 1: Recap – draw four quick sketches of the types of plate boundary movement that you learnt for IGCSE…add some labels too to support your sketches…

Main Development:

Pgs. 164-165 will help you as will the youtube link below…

Image result for ib companion geo

 

You are to work independently on creating a profile for each of the key mechanisms of plate movement…

Internal heating…

  1. Define the mechanismImage result for internal heating plate movement diagram
  2. Draw a labelled diagram of its process
  3. Provide an example in the world

 

 

 

Convection Currents…

  1. Define the mechanism
  2. Draw a labelled diagram of its process
  3. Provide an example in the world

 

Related image

 

 

 

Plumes…

  1. Define the mechanism
  2. Draw a labelled diagram of its process
  3. Provide an example in the world

Image result for plumes diagram

 

 

 

 

 

 

Subduction…

  1. Define the mechanism
  2. Draw a labelled diagram of its process
  3. Provide an example in the world
Image result for subduction

 

Rifting at Plate Margins…

  1. Define the mechanism
  2. Draw a labelled diagram of its process
  3. Provide an example in the world

 

Image result for rifting at plate margins mid atlantic ridge

 

Classification of Mass Movement types…

Classification of Mass Movement types…

Syllabus Point: Classification of mass movement types according to cause (physical and human), liquidity, speed of onset, duration, extent and frequency

A Mass Movement Hazard Event can be defined as any large scale-scale movement of the Earth’s surface that are accompanied by a moving agent such as river, glacier or ocean. They include:

Starter: Task 1: Causes of Mass Movements

From the list below identify which ones are human and physical causes of Mass Movement Hazard Events…

 

The

  • Gravity
  • Farming
  • Tourism
  • Slope angle
  • Internal resistance of the slope – Shear strength
  • Shear stress – forces pulling downslope
  • Earthquakes
  • Drilling
  • Dam building

Now for each one write an explanation of how it might cause a Mass Movement Hazard event…

 

Task 2: Physical and Human causes of Mass Movements continued…

Create a table like the one below. Give three headings – Physical Causes of Mass Movement, Explanation, Human Causes of Mass Movement, Explanation…Use pgs. 174 and 175 and the Google Search Engine to help fill your table with at least five examples for each…

Image result for blank 4 column table

(source: Google Image Search)

 

Task 3: Levels of Liquidity, speed onset and duration…

Liquidity…

Resultado de imagen de mass movements fall slide

 

speed onset…Image result for speed of onset mass movement diagram

Types of Mass Movement and the classification of mass movements by speed

 

Duration…

The Duration of Mass Movements is heavily connected to speed onset, as you can see in the diagram above….

Complete the table below providing the 4 column titles:

  • Mass movement
  • Speed Onset
  • Duration
  • Explanation for duration of movement

Image result for blank diagram 4 columns

Task 4: Extent…(Spatial Distribution…)

Image result for landslide susceptibilityhttps://earthobservatory.nasa.gov(source: )

Practice Exam style Questions:

Q1. Describe the global pattern of landslide susceptibility(3marks)

Q2. Explain the global pattern of landslide susceptibility (5marks)

Remember the skill of OSO when describing…

Odd…

Specific..

Odd…

 

Task 5: Frequency…

Resultado de imagen de frequency landslides

Print off the above graph and annotate the Five key areas with reference to rainfall and frequency…

Access slide show  at the top of this page and on slide 58 answer practice exam questions (i) and (ii)…

Plenary: Working on our EAQs…

Using a specific case study, examine the causes, consequences and responses to a Mass Movement Hazard Event (10marks)

Characteristics of Volcanoes…

Characteristics of Volcanoes…

Syllabus Point: To know the characteristics of volcanoes (shield, composite and cinder) formed by varying types of volcanic eruption; and associated secondary hazards (pyroclastic flows, lahars, landslides)

Starter: 

Task 1: Define the key terms:

Shield volcanoes

Composite volcanoes

Cinder volcanoes

Secondary hazards

Pyroclastic Flows

Lahars

Landslides

 

Main Development:

Task 2:

Create a profile on the tasksheet link below of the Three types of volcanoe important for your syllabus (Composite, Shield and Cinder) providing the followig for each:

  • A diagram with lables
  • A description of the features of the volcanoe
  • Examples from around the world
  • The types of Secondary Hazards that take place at that volcano

Composite, Shield and Cinder Volcanoes tasksheet

 

 https://en.wikipedia.org/wiki/Stratovolcano

 https://en.wikipedia.org/wiki/Shield_volcano

 https://en.wikipedia.org/wiki/Cinder_cone

A Composite Volcano

Image result for composite volcanoes

(source: https://www.thinglink.com/scene/713167024020258817)

A Shield Volcano

Image result for shield volcano DIAGRAM

(source: http://www.diventare.co/Schematics/shield-volcano-diagram.html)

A Cinder Volcano

Image result for cinder volcano DIAGRAM

(source: https://en.wikipedia.org/wiki/Cinder_cone)

 

Image result for cinder volcano DIAGRAM

(source: https://www.zmescience.com/other/science-abc/types-of-volcano/)

Characteristics of Earthquakes…

Characteristics of Earthquakes…

Syllabus Point: 

Characteristics of earthquakes (depth of focus, epicentre and wave types)
caused by varying types of plate margin movement and human triggers (dam
building, resource extraction); and associated secondary hazards (tsunami,
landslides, liquefaction, transverse faults)

Starter: 

Task 1: Define the key terms:

Epicentre

Focus/Deep Focus/Shallow Focus

Seismic Waves/(P) Waves/ (S) Waves/ Surface Waves

Plate Boundaries

Human Triggers

Secondary Hazards – tsunamis, landslides, liquefaction, transverse faults

Main Development:

Task 2:

Create a profile on the task sheet link below of the Four Plate Boundaries (Destructive, Constructive, Collision, Conservative) providing the following for each:

  • A diagram with lables
  • A description of the plate tectonic setting
  • Examples from around the work
  • The types of Geophysical Hazards that take place on the boundary

blank plate boundary diagrams

Check the learning….Can you identify the key features of an earthquake on this blank diagram and then answer the key question…

Blank diagram of an erthquake

 

Task 3: Human Triggers of Earthquake Events…

Many earthquakes occur a long way from any plate
boundary. Some of these are related to human activity, such
as the construction of large dams, mining, fracking and the testing of
nuclear weapons.(IB Geography Course Companion 2nd Edition)

For the following Human Triggers of Earthquake Events your task is to:

  1. Explain how the Human event could possibly trigger earthquakes
  2. Identify and Explain the secondary hazards that could result after the eaarthquke event in the case study you are researching

1) Dam Building – Case Study Dam Building in China causes earthquakes…

 http://news.bbc.co.uk/2/hi/science/nature/1974736.stm

 http://news.bbc.co.uk/2/hi/asia-pacific/7120856.stm

 https://www.smithsonianmag.com/science-nature/a-link-between-dams-and-earthquakes-4305816/

2)  Resource extraction – Case Study Oil and Gas extraction in the USA causes earthquakes…

http://theconversation.com/why-is-oil-and-gas-activity-causing-earthquakes-and-can-we-reduce-the-risk-40810

Plenary: 

Read pgs.172 and 173 of your course text book of resultant hazards of earthquakes and create 100 word summary of the secondary hazards that can take place…

Image result for ib course geo companion