PLANET EARTH: ARID REGIONS

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Physical Weathering Examples -_______________ -_______________

-Abrasion can weather rock -Moisture can weather rock

Examples of subtropical deserts -_______________ -_______________ -_______________

-Mojave -Chihuahuan -Sahara

What are the two layers under desert pavement? -__________________ -__________________

-Soil -Old Alluvium

Five types of Deserts -_____________ -_____________ -_____________ -_____________ -_____________

-Subtropical deserts -Rain- shadow deserts -Coastal deserts -Continental interiors -Polar deserts

How do human activities cause desertification? -__________________ -__________________ -__________________

-expansion and intensive use of agricultural lands -poor irrigation practices -deforestation

desert pavement is a surface layer of closely packed or cemented -_______________ -________________ -________________

-pebbles -gravel -rock fragments

desert

A barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life.

subtropical desert

A biome prevailing at approximately 30° N and 30° S, with hot temperatures, extremely dry conditions, and sparse vegetation.

Convection Cell

A circular pattern of air rising, air sinking, and wind.

desert varnish

A dark, rusty-brown coating of iron oxide and magnesium oxide that accumulates on the surface of the rock.

rain shadow desert

A dry area on the lee side of a mountain range.

Dune

A hill of sand piled up by the wind

desert pavement

A layer of coarse pebbles and gravel created when wind removed the finer material.

Alluvial Fan

A wide, sloping, fan-shaped deposit of sediment formed where a stream leaves a mountain range

continental interior

Areas in the continental interiors, far from source of moisture where hot summers and cold winters prevail.

Eventually a Mesa can end up as a _______________ or a _________________

Butte Chimeny

The last slide is an example of the ______________________

The Law of Superposition

polar desert

a high-latitude region that receives very little precipitation

Hadley Cell

a system of vertical and horizontal air circulation predominating in tropical and subtropical regions and creating major weather patterns.

As time increases, _______________ increase

amount of erosion

With desert pavement, the light things are ____________________

blown away

In regards to erosion in deserts, fine sand grains are removed leaving behind coarser material. The process is called deflation and the material left behind forms a __________________

desert pavement.

playa

dried up lake bed

The backside of the mountain is ________________

dry desert

Mesa

flat-topped mountain or hill. It is a wide, flat, elevated landform with steep sides.

Desertification facilitates ____________________ that cross entire ocean basins and carry __________________ and __________________

large dust storms dangerous chemicals and disease organisms.

Subtropical: At 0* at earth's equator, ___________ rises and ____________ descends

moist air dry air

dunes may _______________ over time and may ________________ over time

move change form

Polar deserts have a _______________ if there is not enough snow

net loss of ice

Polar deserts have no __________, just _________

no rain, just snow

coastal desert

occur in cool to warm areas along the coast. They have cool winters and long, warm summers.

deserts are very ______________ and ______________ environments

sensitive and fragile

These unsustainable land uses place enormous pressure on the land by altering its ________________ and _________________.

soil chemistry and hydrology

Desert landscapes may consist of __________ on the top and ______________ on the sides

strong rock rubble

Lag Deposit

the coarse sediment left behind in a desert after wind erosion removes the finer sediment

Coastal Deserts come in contact with ____________________

warm and cold currents

In deserts, the primary agent of erosion is ____________ the secondary agent of erosion is _____________

water wind


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