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2425574
The Restless Earth
Descrição
Notes on the topic 'The restless earth' for Geography.
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geography
gcse
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Hannah of Death
, atualizado more than 1 year ago
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Hannah of Death
aproximadamente 9 anos atrás
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Resumo de Recurso
The Restless Earth
Volcanoes
Created by the eruption of magma onto the earths surface
Different types
Classified by their type of eruption
Shield Volcano
Gentle slope
Fluid lava
Low, wide cone
Constructive plate boundaries
Eruptions are frequent
Eruptions are Gentle
Composite Volcano
Destructive plate boundaries
Alternating layers of lava and ash
Eruptions
High silica content
could be pyroclastic flows
Steep slopes
EYJAFJALLAJOKULL
Super volcanoes
Erupts at least 1000 km³ of material
Forms a depression in the ground
Calderas
Often has a higher ridge around it
Eruptions infrequent
Hundreds of thousands of years apart
YELLOW STONE
Earth's Crust
Tectonic Plates
Convection currents move them
In the mantle
Circular currents of heat
Continental plates
Oceanic plates
Plate Boundaries
Conservative plate boundary
Two plates sliding past eachother
In the same direction. Slightly different angles and speeds
Build up of energy released causes earthquakes
No volcanoes
Curst isn't destroyed or made. No source of magma.
Destructive plate boundaries
Plates collide
Any plates
Oceanic and Continental
Oceanic plate is denser
It subducts under continental plate
magma formed as plate melts
Oceanic Trenches
Continental and Continental
Pressure displaces sediments
Fold Mountains
THE ANDES
Constructive Plate boundaries
Plates move apart
Occurs under water
Magma erupts to the surface
It cools to create new land
Divided into Tectonic plates
38 minor
14 major
Earth Quakes
Measuring Earthquakes
Richter Scale
10 fold increase when the scale increases by 1
Scale 2 earthquakes is 10 times more powerful than a scale 1 earthquake.
Measures the effects of earthquakes
Uses subjective descriptions of the reuslting damage
Scale= I-XII
Focus
The point where the earthquake occurs
Epicentre
The point at the earth's surface directly above the focus
KOBE, JAPAN
MEDC
HAITI
LEDC
The 3 p's
Prediction
Japan monitor earth tremors
Protection
Building to an appropriate standard
Preparation
Drills, hospitals practicing for major disasters
Tsunami
THE BOXING DAY TSUNAMI
Primary Effect
Crust shifting
Secondary Effect
Displacement of water
800 KPH
Approach the coast unnoticed
Near land the slow
Reduce in length
Gain in height
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