Download plate boundaries

SCUOLA MEDIA VOLTA BOLOGNA
A. S. 2012-2013
Content and language
integrated learning
SUBJECT: CONTINENTAL DRIFT AND PLATE
TECTONICS
CLASS: 3°A – 3°C - 3°D – 3°H
PLATE TECTONICS
PLATE BOUNDARIES
120 millions years ago
WHAT
HAPPENED?
225 millions years ago
180 to 120 millions years
ago
CONTINENTAL
DRIFT
65 millions years ago
NOW
PLAY THE GAME
PLATE BOUNDARIES
There are a number of different types of plate boundary.
Destructive plate boundary
http://www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev4.shtml
A destructive plate boundary is sometimes called a
convergent plate margin. This occurs when oceanic
and continental plates move together. The oceanic plate
is forced under the lighter continental plate, causing
mountains and possibly volcanoes to form along the
destructive plate boundary. Magma rises up through
cracks and erupts onto the surface. Friction causes
melting of the oceanic plate and may trigger
earthquakes.
An example of a destructive plate boundary is where the
Nazca plate is forced under the South American Plate.
Destructive plate boundary
Nazca plate is forced under the South American Plate.
Collision zones
Collision zones form when two continental plates
collide. Neither plate is forced under the other, and so
both are forced up and form fold mountains.
This is how mountain ranges such as the Himalayas
and the Alps were formed.
Constructive plate boundary
A constructive plate boundary, sometimes called a
divergent plate margin, occurs when plates move
apart. Volcanoes are formed as magma wells up to
fill the gap, and eventually new crust is formed.
An example of a constructive plate boundary is the
Mid-Atlantic Ridge.
http://www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev3.shtml
The animation shows how magma pushes up between the two
plates, causing a chain of volcanoes along the constructive plate
boundary.
Conservative plate boundary
A conservative plate boundary, sometimes called a
transform plate margin, occurs where plates slide past
each other in opposite directions, or in the same direction
but at different speeds.
Friction is eventually overcome and the plates slip past in a
sudden movement. The shockwaves created produce an
earthquake.
This occurs at the San Andreas Fault in California.
San Andreas Fault map
San Andreas Fault
PLATE BOUNDARIES
GLOSSARY
Write in column B the right words from column C
Column A
English words
Column B
Italian words
Column C
Choice
Constructive/divergent
plate boundary
Si allontanano
lighter
deriva dei continenti
Mid-Atlantic ridge
Margine tra zolle
To collide
Margine distruttivo/convergente tra
zolle
Destructive/convergent
plate boundary
Più leggero
friction
Si muovono insieme
Plate boundary
dorsale Medio-Atlantica
Fold mountains
margine costruttivo/divergente tra zolle
continental drift
attrito
Conservative/transform
plate boundary
Entrare in collisione
Move together
corrugamenti
New crust is formed
Margine conservativo/trascorrente tra
zolle
Move apart
Fuoriesce e riempie la frattura
Through cracks
Si forma nuova crosta
Wells up to fill the gap
Attraverso le spaccature
Plates slide past each
other
Movimento improvviso
Sudden movement
Onde d’urto
Plates slip past
Le zolle scorrono l’una di fianco
all’altra
friction
Le zolle scivolano l’una sotto l’altra
shockwaves
attrito
Answer the questions
1. Give an example of destructive plate boundary
___________________________________________
What happens?
___________________________________________
_________________________________________
__
2. Give an example of constructive plate boundary.
___________________________________________
What happens?
___________________________________________
_________________________________________
__
3. Give an example of conservative plate boundary.
__________________________________________
What happens?
___________________________________________
_________________________________________
__
Translate the full text on your copybook.
TEST
1) A constructive or divergent plate boundary is when:
- plates move together.
- plates move apart.
- plates slide past each other causing friction.
2) A destructive or convergent boundary is when:
- plates move together.
- plates move apart.
- plates slide past each other.
3) At a conservative plate boundary land is:
- destroyed.
- created.
- neither created or destroyed.
4) The Himalayas were formed on what kind of plate
boundary?
- Constructive
- Destructive
- Conservative
5) The Mid-Atlantic Ridge or chain of volcanoes
formed underneath the Atlantic Ocean is created by
what kind of plate boundary?
- Constructive
- Destructive
- Conservative