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GCSE Geography
Tectonic hazards…read more

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A tectonic hazard is a type of Natural hazard.
A natural hazard is a naturally occurring event with the potential to
affect people's lives and property. When natural hazards do affect
people's lives or property they are called natural disasters.
Earthquakes and volcanoes are tectonic hazards ­ they're caused by
the movement of tectonic plates.…read more

Slide 3

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Tectonic plates
The earth's surface is separated into plates. These are called the Tectonic Plates.
Key: Plate margin/boundary Direction of plate movement…read more

Slide 4

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Tectonic plates continued...
At the centre of the Earth is the Inner core which is a ball
of solid iron and nickel. Then there is an outer core which
is liquid. Around the core is the mantle, which is semi-
molten rock and it moves very slowly. The outer layer of
the Earth is called the crust and it is very thin (only about
The crust is divided into lots of slabs which are the
Tectonic Plates(they float on top of the mantle). Plates
are made of two types of crust:
·Continental crust ­ Thicker and less dense
·Oceanic crust ­ Thinner and more dense
The plates move due the rock in the mantle moving
beneath them. The places where the plates meet are
called boundaries or plate margins.…read more

Slide 5

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Types of Tectonic Plate Margins
Tectonic Plate margins are places where plates meet. There are three different
types of plate margin.
1) Destructive margins.
Destructive plate margins are where two plates
are moving towards each other.
Where an oceanic plate meets a continental plate,
the denser oceanic plate is forced down into the
mantle and is destroyed. This often creates
volcanoes and ocean trenches (very deep sections
of the ocean floor where the oceanic plate goes
Where two continental plates meet, the plates
smash together, but no crust is destroyed.…read more

Slide 6

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2) Constructive margins.
Constructive margins are where plates are moving away from each other. Magma (molten
rock) rises from the mantle to fill the gap and cools, creating a new crust.…read more

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