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27 Cards in this Set
- Front
- Back
Erosion
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the wearing away of rock and soil from river banks and coasts
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Erosion: Hydraulic Action
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is where water forces air into cracks and crevices, gradually wearing them away with time
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Erosion: Abrasion
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is where rocks carried by the river gradually wear away the banks and the bed
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Erosion: Attrition
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is when rocks carried by the river crash into each other creating smaller and smoother particles
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Transportation: Solution
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is when particles of rock dissolve into the river, and then gets carried away in its dissolved form
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Transportation: Saltation
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is when small pebbles and stones bounce along the river bed.
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Transportation: Suspension
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is where small, light material is carried by the river
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Transportation: Traction
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is where large boulders and rocks roll along the river bed
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MEDC Flood
date: Area: Cause: other: |
Boscastle Floods
16th Aughust 2004, North West Cornwall, The remnants of hurricane Alex / Masses of Rainfall / the confluence of the rivers Jordan &Valency, No Deaths, £20 million price tag estimated by insurance companies |
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How where the Boscastle floods dealt with:
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New flood defence wall
remove trees near the river so less debris widen the river |
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LEDC Floods
date: Area: Cause: Other: |
Bangladesh floods
July - September 1998 India Exceptionally heavy seasonal rains / River Ganges diverted for irrigation / Bangladeshi debt means that flood defences are unaffordable. 1040 people died, 2/3rds of the country was flooded, damage to farm land devastating |
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How the Bangladesh Floods where dealt with:
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7,500km of flood embankment built
Water table to be lowered by crop irrigation plans made for future warning and relief services |
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what is the structure of rock at a waterfall?
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Hard rock slab at the top, with soft rock contained underneath
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Drainage Basin
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Colorado Drainage basin
hoover dam, aqueducts etc used to transport water over hundreds of kilometres to support the demand for water, a particular user of this water is las vegas |
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What is population distribution?
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How spread out the population
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What is population distribution?
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How many people are in a given area
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how do you calculate population density?
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population
---------------- = population (km^2) area (km) |
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Give three examples of where you will find a sparse population density:
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High land (mountains)
unreliable water source areas of forest |
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Give three examples of where you will find a highly dense population density:
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areas of industrial development
Government investment in an area Areas of grassland |
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what is birth rate?
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the number of people born per 1,000 of the population
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why would a country have a high birth rate?
which type of country would usually have a high birthrate? |
social standards accept 5 or more children
one successful child may lift the family out of poverty when women have little or no formal eduction LEDC |
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why would a country have a low birth rate?
which type of country would usually have a low birthrate? |
Well educated women
one or two children are socially acceptable children are unlikely to contribute to family income MEDC |
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what is death rate?
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the number of people that die per 1,000 of the population
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why would a country have a high death rate?
which type of country would usually have a high death rate? |
Water shortage
dirty water wars Countries with a high birth rate will tend to have a high death rate |
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why would a country have a low death rate?
which type of country would usually have a low death rate? |
good health care
not many natural disasters clean water supply Countries with a low birth rate will tend to have a low death rate |
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What is the demographic transition model?
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its a graph that shows the typical evolution of birth and death rates as well as total population. most countries are stage 3 or 4 and only a few are in the beginnings of stage 5
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What is a population structure?
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It is a dual bar graph that shows that shows the distribution of males and females as well as age groups in the population
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