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Plate tectonics




Convection
Currents
1. Radioactive decay in the core causes heat radiation 1200'c
2. Molten rock is heated and rises
3. Semi-molten rock spreads, driving the plates
4. Movements of current = direction of plate
5. Rock cools, more dense and sinks
6. Reheated and travels back up (less…

Page 2

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1. Oceanic Plate moves due to convection currents
2. Subduction zone ­ oceanic crust is heavy and sinks under continental plate
3. Rock melts due to friction and heat from mantle. Friction also causes earthquakes
4. Melted rock rises taking water with it, making it less dense
5. Edge of…

Page 3

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Rising magma causes swelling and bulging of the volcano ­ tiltmeter or GPS ­
satellite detects movements
Seeping gas
Gurgling and belching noises

Fold Mountains
Formed by folded sedimentary rock
Found at convergent boundary
Examples = Alps, Rockies, Himalayas

1. Sediments settles in depressions on the seabed,
called Geosynclines
2.…

Page 4

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Winter sports ­ resorts like Avalanches ­ constant
Chamonix = tourism = threat, money spent to
economy prevent them
Agriculture ­ south facing Climate ­ cold and wet , Cereals, sugar beet, vines
slopes e.g. industrially and agriculturally and fruits
Himalayans/Nepalese people difficult (machines can't
operate, short crop growing Transhumance…

Page 5

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Place Info Primary effects Secondary effects


Borders India and Badly built buildings Crops survived,
LEDC Pakistan collapsed markets re-opened,
Kashmir 7.6 R. Scale 79, 000 killed jobs for farmers
Earthquak 60 seconds long 100,000 injured Office/shop damage
8:40am, 8th Oct 05 3.3 m homes ­ jobs lost
e 2 day…

Page 6

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Chances Peak 50% population returned to the
eruption in July 1955 evacuated to north of island
Plymouth Brades the island
N & S American Forest fires
plates vs Caribbean
plate
Expanding lava
dome + large
pyroclastic flow

Page 7

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Factors affecting severity of an earthquake
Aid sources
Response times of emergency services
Technology (e.g. quakeproof buildings )
Geographical Location ­ near boundaries, import of aid...
Economic Status ­ money for repairs...
Building regulations

Why do people live in tectonically active areas?




Factors affecting differences in responses for earthquakes &…

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