« previous next »

Author Question: Briefly describe two hypotheses used to explain the formation of desert pavement. What will be an ... (Read 63 times)

Chelseaamend

  • Hero Member
  • *****
  • Posts: 545
on: Jul 14, 2018
Briefly describe two hypotheses used to explain the formation of desert pavement.
 
  What will be an ideal response?

Question 2

Describe how sand dunes migrate.
 
  What will be an ideal response?


katieost

  • Sr. Member
  • ****
  • Posts: 358
Reply #1 on: Jul 14, 2018
Answer to Question 1

Desert pavement is thought to form by either (1) deflation lowering the land surface by removing sand and silt from poorly sorted sediment, leaving only gravel and pebbles behind in a cobblestone-type arrangement, or (2) a surface that initially consists of pebbles trapping fine wind-blown sediment at protruding cobbles, forcing the fine grains to settle downward between the pebble spaces.

Answer to Question 2

Due to obstacles (vegetation, rocks, and so on) creating shadows that protect from prevailing winds, grains of sand can be deposited and remain in these wind shadows. Eventually, the sand accumulates into a dune with an asymmetrical profile, the windward slope being gently inclined and the leeward slope being steep. Between this profile and the prevailing winds, sand is continually rolled up the gentle slope and falls down the steep slope (slip face), slowly migrating the dune in the direction of air movement.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Did you know?

Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.

Methicilli ...
Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

The formation of a fat The formation of a fat
Formation of a Bipolar Planetary Nebula Formation of a Bipolar Planetary Nebula
Tornado Formation: Nonsupercell Tornado Development Tornado Formation: Nonsupercell Tornado Development
Formation of Dilute Urine Formation of Dilute Urine
Peptide bond formation between two amino acids, resulting from a dehydration reaction Peptide bond formation between two amino acids, resulting from a dehydration reaction
Surtsey, a volcanic island, during the time of its formation. Surtsey, a volcanic island, during the time of its formation.
Video: Nervous pathway to the Neuromuscular (NMJ)

For a complete list of videos, visit our video library