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Slide 1

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Unit 1…read more

Slide 2

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Restless Earth
Spec (what you need to know)
How and Why do earth tectonic plates move?
Earths interior has a layered structure, with different composition
and physical properties; the earths core generates heat and
convection currents drive plate motion.
There are conservative, constructive and destructive plate
boundaries, each with characteristic volcanic and earthquake
What are effects and management issues resulting from tectonic
Volcanic and earthquake hazards affect people in different ways
and at contrasting locations.
Management of volcanic and earthquake hazards, at constrasting
locations, ranging from short term relief to long term planning,
preparation and prediction…read more

Slide 3

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Key Terms
Asthenosphere- Part of earths mantle. Hot, semi molten lower beneath plates.
20km-70km thick.
Conservative Boundary- Plates slide past each other, friction causes
earthquakes. Rare but destructive.
Constructive boundary- Plates move apart, magma rises up through gap. Magma
is basalt so very hot and runny.…read more

Slide 4

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Key Terms
Continental crust- Part of earths crust that makes the continent 25-100fk thick
Convection currents- Convection currents are the circular motion in a liquid
caused by heating and cooling. Convection current is the flow of hot fluid in
a circular pattern.
Core- Centre of the earth
Destructive boundary- Plates push together. Oceanic plate is sub ducted as it
sinks, it melts and makes magma called andesite.…read more

Slide 5

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Key Terms
Long term planning- Plan ahead for an earthquake. Expensive. Build buildings that
can sway.
Magnitude- Power and how much the ground shakes.
Oceanic crust- Earths crust under the ocean. Basalt 5km -10km thick
Prediction-When the government predicts an earthquake.
Preparation- How a country prepares for an earthquake.
Response- How a country recovers from an earthquake.
Plate margin- Meeting of one plate with another.
Collision plate boundary- A collision margin occurs when two plates moving together
are both made from continental crust. Continental crust cannot sink or be
destroyed, and as a result the land between them is pushed upwards to form
high `fold' mountains like the Himalayas.…read more

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