Flashcards
restless earth flashcards
Cards in this deck (29)
- 1How thick is the crust16km-60km
- 2The lithosphere consists of what?continental crust and the oceanic crust
- 3Name two features of continental crustMade of granite
Physical state is solid - 4Name two features of oceanic crust?Made of Basalt
Physical state is solid - 5What temperature is the core?4000-5000 degrees
- 6How do convection currents cause plate movement1. The core heats the molten rock in the mantle to create a convection current.
2. Heated rock from the mantle rises to the Earth's surface.
3. At the surface the convection current moves the tectonic plates in the crust.
4. Molten rock cools and flows back to the core to be reheated. - 7What happens when two plates are pulled apart?A new crust is created
- 8What is a hotspotHeat rising as columns
- 9what does subduction used to describe in plate movementwhen the oceanic plate sinks beneath the continental plate because it's denser
- 10name the four plate boundariesdestructive
constructive
conservative
collision - 11why would a developing country that suffers from an earthquake result in more deaths than a developed country?because it would have less money to build earthquake proof buildings than developed countries resulting in more people killed.
- 12the impact of a hazard depends onthe size of the even
vulnerability of population
how prepared they are - 13what generate earthquakes?volcanic eruptions as well as conservative plate boundaries
- 14where can some volcanoes be found?at hotspots
- 15shield volcano characteristics- found on constructive plate boundaries
- thin runny lava
- gently sloping sides
- contains basaltic magma
- frequent
- non violent - 16strato volcano characteristics- found on destructive plate boundaries
- viscous sticky lava
- steep sides
- contains andesitic magma
- infrequent
- violent - 17what measures the strength of the volcanomagnitude
- 18what does the Richter scale measurethe amount of energy released
- 19what measures the effects of the volcano?mercalli scale
- 20why do some volcanoes cause more damage than others?it all depends on the time of day, the vulnerability of the area economically and environmentally. the population density and severity of the eruption also contribute
- 21why are natural hazards difficult to predict?because we don't know when they will happen, how big they may be, whereabouts it will take place.
- 22what can help us predict them?volcanoes swelling
increase in gas emissions
animals moving away from the area
increase in soil temperature - 23list three things needed after a natural hazard occurs?volunteers
clean water
medical help - 245 ways to strengthen a building?- rubber and steel foundations
- cross bracing
- deeper foundations
- strong framework
- strengthen walls - 25one way a developing country may strengthen a building differently?add timber diagonal braces which reduce movement
- 26an example of an earthquake?Haiti 2010
7.0 magnitude - 27primary impacts of the Haiti earthquake?- people trapped under rubble
- phone lines down
- streets blocked from collapsed buildings
- powerlines down - 28why were the immediate responses to the earthquake so slowbecause it is a very poor country and the relief effort was uncoordinated
- 29another volcano examplemontserrat volcano 1995
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- GCSE Geography (dynamic planet) Flashcards on restless earth flashcards, created by freya.bellack on 09/09/2015.
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- freya.bellack
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