ARID LANDSCAPES

what is arid landscapes

its a dry region with little rain

what is desert

dry regions that cover 30 percent of earths land surface

two types of climatic types are?

• DESERT or ARID

  • STEPPE or SEMIARID

2 regions of drylands?

• SUBTROPIC

  • low altitude deserts

• MIDDLE LATITUDES

  • located in the deep interior of continents

what is EPEHERMAL

carry water only during periods of rainfall

what is EPHEMERAL STREAMS

DONGA

NULLAH

desert raifall

rain often occurs as HEAVY SHOWERS

NOTES:

• runoff is largely unhindered (means nothing is stopping it)

• Flash floods are common

• EROSION in desert is done by running water

WIND EROSION

• transport of sediment by wind

• wind is less capable of picking up course materials

  • not confined to channels and can spread over large areas

what is DEFLATION

• lifting of LOOSE materials

• produces BLOWOUTS (shallow depression)

• produces DESERT PAVEMENT (a surface of coarse pebbles and cobbles)

what are 2 types of wind deposits

• DUNES

  • mounds or ridges of sand

  • asymmetrical shaped

• LOESS

  • blankets of windblown SILT

  • 2 sources: DESERTS & GLACIAL OUTWASH DEPOSIT