Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
role of water in deserts
|
erodes via flash floods on the rare occassion of heavy rain
no vegetation to anchor sand, runoff is rapid does most of erosional work in deserts |
|
|
ephemeral
|
type of river in desert, only carry water in response to rainfall
|
|
|
desert streams
|
short, usually don't reach sea
rapidly deplete b/c water table is too deep no tributary system |
|
|
interior drainage
|
small streams that start and end in the desert
discontinuous river system, no tributaries |
|
|
alluvial fan
|
cone of debris at mouth of canyon
deposited by water when it slows down after flowing down canyon sides |
|
|
playa lakes
|
temporary lakes formed in canyons after floods
|
|
|
definition of wind
|
the movement of air from high to low pressure
|
|
|
conditions favoring wind erosion
|
deserts: dry w/ small loose sediment
|
|
|
desert pavement and deflation
|
wind picks up sand from in between gravel (deflation,) leaving only gravel layers (desert pavement)
|
|
|
ventifacts
|
large pebbles with flat faces from wind abrasion
|
|
|
dunes
|
piles of sand form when wind is obstructed, slows down and deposits sand
|
|
|
loess
|
silt deposited by wind
|
|
|
crescent dunes
|
dunes formed in crescent shape when wind blows only in 1 direction
|
|
|
linear dunes
|
dunes formed paralel to the wind
|
|
|
star dunes
|
dunes formed when wind blows in all directions
|
