Lab 12: Arid Landforms

Bajadas

Alluvial fans at the base of mountain slopes may merge to form broad sloping _______________.

Angular

Arid landscapes are typically described as _______________.

10

Arid regions are defined as receiving less than _________ inches of rain in a year.

Arid

Flash floods are a very erosive and dangerous event that can occur in an ___________ environment

Limestones; sandstones

In arid climates ___________ and ___________ are physically and chemically resistant ridge formers.

Physical weathering; chemical weathering

In arid environments, _____________________ is more important than ______________________ due to lack of water.

Limestone

In humid environments this type of rock is typically highly dissolvable and would form valleys and lowlands instead of mountains and cliffs.

Chemical weathering; soluble

In the absence of intensive ___________________, ____________ rocks become resistant ridge formers.

Slowly

Processes of weathering and erosion happen much more ___________ in arid climates compared to humid climates.

Creep

______________ are sand and larger grains gradually pushed along surface by grain impacts.

Saltation

_______________ is sands grains bounce or hop along the surface.

Playa lakes/salt pans

_______________ result when evaporation exceeds both precipitation and runoff, these lakes precipitate out salts as the lakes dry out.

Suspension

________________ is fine sand and silt carried by the wind.

Alluvial fans

__________________ are a cone, or fan-shaped deposit, of corase sediments is formed.

Barchans

What type of sand dunes are represented by the diagram?

Longitudinal

What type of sand dunes are represented by the diagram?

Parabolic

What type of sand dunes are represented by the diagram?

Transverse

What type of sand dunes are represented by the diagram?

False- it results from sand supply and the presence of vegetation

TRUE or FALSE: Dune shapes only result form wind direction.

False

TRUE or FALSE: Sand dunes will never migrate from their original location.

Alluvial fan

The above image is an example of what landform?

Interdune

This describes what kind of environment: - Vegetated areas from high water tables and springs - Oases (ponds and springs) - Grass and other vegetation surrounding active dunes

Ergs

Vast areas covered by sand dunes are called sand seas, or _____________, and occur in arid or semiarid climates/

Water

Weathering and erosion are slowed by the lack of ___________.