Year 9 Geography – DANGEROUS EARTH
Tectonics video worksheet
video `Tectonics` worksheet
FACT FILE (0` 0`` to 3` 34``)
Inner
Core
Outer
Core
Mantle
Crust
Solid ball of iron and nickel
under high pressure
temperature3,700oC
Molten less pressure
Hot rocks (silicates)
3,000 km thick
Hard but very thin
Cracked and brittle
Made up of segments
(plates)
1. There are 2 types of crustal plates:
Continental plates
Ocean plates
6
heavier &
25 to 90 km thick
ancient lightweight
rocks
km thick
younger rocks
(not to scale)
2. Plate movement
Continental crust
Convection currents in
the mantle rise, separate
and pull apart the crust
Hot Core
Add to the diagram
 Arrows to show direction of magma movement
 The two types of crustal plates (+ names)
3. Types of plate movement (complete boxes) :
1. Moving
2. Move
each other
3.
past one another
4. These plate movements have created features like:
Mountain ……………. earthquakes volcanoes many …………
Year 9 Geography – DANGEROUS EARTH
Tectonics video worksheet
CONSTRUCTIVE MARGINS (3`34`` to 5` 40``)
PAUSE at 5`17``
How `Surtsey` island was formed
Since 1492 (when Columbus set sail) the Atlantic Ocean has grown by 25 metres
DESTRUCTIVE MARGINS (5`43`` to
(PAUSE at 7`10`` to complete the text:)
Where the h……….. Oceanic plate
pushes under lighter C……………….
plate, an ocean t……….. is formed.
The Oceanic plate then b………….. up
under immense pressure.
Friction and rising temperatures cause
the plate to m……. and the molten
magma rises forming a line of volcanoes
Year 9 Geography – DANGEROUS EARTH
Tectonics video worksheet
e.g. Mount Etna, Sicily, Italy, Southern Europe …………………….
………………………………………………………………………………………
Extension task (7`20`` to 9` 15``)
Use data from the video to explain what happens when a volcano erupts.
Seimometers tilt meters
steam rocks
magma
plug (or dome)
gas
foaming magma
sand exploding rocks boulders ash mudflow