Things I don't know Flashcards
Definition of arid desert
Less than 250mm a year
Definition of semi-arid desert
250mm-500mm a year
Definition of hyper-arid
Less then 50mm a year
Hammada
Barren and rocky ground
Reg
Gravel/pebble plain
Erg
Predominantly sand dunes
Posh name desert soils
aridisols
Insolation weathering
Expansion and contraction of rocks until they exfoliate
duricrust
Salt crust
Exogenous river
Source is outside of desert`
endoreic rivers
Terminate in deserts
Ephermal rivers
Follow seasonally or during flash floods
Green wall project
15km tree belt in senegal
Baseflow
Slow transfer through rocks
Water budget- what is it and what are the four stages
Shows change in water balance Recharge Surplus Utilizations Deficit
Recharge
Surplus
Utilizations
Deficit
Recharge- precipitation exceeds evapotranspiration- yet to reach field capacity
Surplus- soil reaches full field capacity
Utilizations- evapotranspiration exceeds precipitation but soil storage is yet to reach 0
Deficit- soil storage reaches 0
Vertical erosion
Removal of material by cutting into rock by rivers in the upper course
Lateral erosion
General erosion or removal of surface material in the middle and lower course
How to calculate hydraulic radius (efficiency of river)
CSA/Wetted perimeter
Orogenensis/isostatic change
Land change –> rejuvenation
Eustatic change
Sea level change
Prevalence rate
No. people suffering from a disease at one time
Incidence rate
How many people developed a disease in a population over a year
Case mortality rate
Number of people dying from a particular disease
Difference between undernourishment and malnutrition
Undernourishment is a lack of quantity malnutrition is lack of quality
Malthusian view vs Boserupian view
M= reduction in population is good due to less strain on resources B= bad because it leads to economic slow down
Snowy mountain scheme
Australia in 50s built damns and supplies water for 60% of food and wine production
