5.2
OUR CRACKED EARTH
TECTONIC PLATES
R E A D
• The surface of the Earth is broken up into large pieces – called plates
• The following gif image will show you how it would look like
if we could actually see them
These plates are constantly moving, as they are being dragged around by the molten (liquid/melted)
magma underneath
5.2
OUR CRACKED EARTH
BELOW THE CRUST – CONVECTION CURRENTS
• CONVECTION CURRENT is the movement of the mantle as it is heated from
below, and then gets cooled from above
R E A D
• PAY CLOSE ATTENTION to the arrows in the picture below
Look at these
two plates
dragged
The arrows indicate being
the movement
each
of hot liquid magmatowards
beneath
the
other
plates
The magma closest to the core
becomes very hot and rises towards
the crust
It is caused by
CONVECTION
As it reaches the crust it becomes
CURRENTS
cooler, denser and sinks back down.
happening here
There it melts again.
5.3
A CLOSER LOOK AT PLATE MOVEMENTS
PLATE BOUNDARIES
Textbook - page 122
PLATE BOUNDARY - location where two plates meet
R E A D
The plates’ relative motion determines the type of boundary:
Convergent
From the word ‘converge’. Meaning to join or meet
Divergent
From the word ‘diverge’. It means ‘separate’ or ‘go apart’
Transform
Where one type of plate boundary is terminated it is
transformed into a boundary of a different type
Earthquakes, volcanic activity, mountain-building, and oceanic trench
formation occur along these plate boundaries.
5.3
Type of boundary
R E A D
Motion
Effect
Volcanic activity
Diagram
A CLOSER LOOK AT PLATE MOVEMENTS
PLATE BOUNDARIES
CONVERGENT
DIVERGENT
Move away from
Move towards each
each other /
other / collide
separate
Destructive –
Constructive oceanic crust
oceanic crust
destroyed
created
Yes
Yes
TRANSFORM
Slide past each
other horizontally
Conservative –
neither destroyed
nor built
No
TODAY’S ACTIVITY
COMPLETE THE ACTIVITY AND SUBMIT THE SCREENSHOT OF THE SCORE
• https://www.liveworksheets.com/worksheets/en/Science/Layers_of_the_earth/
Layers_of_the_Earth_jn1876400kb
• https://www.liveworksheets.com/tj2113278xp