Geosphere Flashcards
Controls on regional rainfall
Atmospheric circulation
Rain shadow effects
Ocean circulation
What is meant by the term avulsion
The rapid abandonment of a river channel and the formation of a new river channel
What is a yardang
A sharp irregular ridge of sand lying in the direction of the prevailing wind in exposed desert regions. Formed by the wind erosion of adjacent material which is less resistant
The long profile of a long hill slope in equilibrium is
Convexo-concave
What is a drainage basin?
An area of land that all drains to the same outlet
Name 3 geomorphological features that are the result of glacial erosion
Cirque
Eskers
Drumlins
Arid regions are characterised by yearly precipitation amounts of …
Below 250mm/year
Where are the tips of parabolic dunes positioned
Pointing upwind into the prevailing wind direction
What local factor least affects sediment deposition in estuaries
Rainfall
Water energy, salinity and sediment size are important factors
What is the typical rate for epeirogenic uplift
0.1mm/year
Diffusion on hillslopes is mainly a function of …
Slope (steepness)
What are inselbergs
Rounded, isolated mountains of rock
Which size of sediment erodes at the lowest Fluvial flow velocity
Sand
