Geology 4th edition by Chernicoff & Whitney

Slides:

Advertisements

Similar presentations

Arid Landforms. Basic Concepts I. Most deserts exhibit highly angular landscapes. mechanical weathering dominates angular particles of weathered rock;

Advertisements

Arid Landforms: Fluvial and Eolian Processes in Arid Zones

 Desertification affects nearly 1 billion people!  This can cause widespread poverty, starvation, and death.  watch?v=iD1Ff1h_4so.

Arid and Semi-Arid Landscapes

Lecture 16 - Deserts. Definition of Desert A desert is an area with less than 25 cm (10 inches) of annual precipitation aridity index = potential evaporation/precipitation.

DESERTS AND WIND ACTION

Characteristics of Deserts Besides being dry > few plants > consist of nearly continuous rock and/or sand exposures  little soil development Weathering,

Chapter 19 Deserts and winds.

GEOG 1113: Physical Geography Arid Processes and Landscapes March 31, 2015.

Lecture Outlines PowerPoint

Deserts & Wind Arid Landscapes.

Eolian Landforms Wind An agent of erosion –“eolian” refers to wind 2 types of eolian erosion: –abrasion: sandblasting YARDANG –deflation: blowing.

Chapter 12 Wind Processes and Desert Landscapes

Desert Landscapes.

Edward J. Tarbuck & Frederick K. Lutgens

GSC 1530 Chapter 19 Deserts and Winds Deserts  Deserts (arid) and steppes (semiarid) lands occupy about percent of Earth’s land surface – more.

Classroom presentations to accompany Understanding Earth, 3rd edition prepared by Peter Copeland and William Dupré University of Houston Chapter 14 Wind.

CHAPTER 21: DESERTS AND WIND

Earth: An Introduction to Physical Geology, 10e

Deserts, Wind, and Dunes Dr. R. B. Schultz. Deserts and Wind Action (Aeolian Processes) Desert -- arid land with less than 250 mm (10 inches) precipitation.

Deserts and Wind Action

Desert Landforms. What % of land area is desert? About 30%

Notes for Section 8.2—Wind. Wind Wind causes erosion by transporting sediments uphill as well as downhill. Wind can modify and change landscapes in arid.

Deserts Deserts: definition A region which has an arid climate or where evaporation exceeds precipitation Steppe: region often adjacent to a desert.

Dry Regions: The Geology of Deserts

Glaciers, Deserts, and Wind Chapter 6

Lecture Outlines Physical Geology, 14/e Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plummer, Carlson &

Chapter 15 Eolian Processes and Arid Landscapes

Mass Movements, Wind, and Glaciers

Deserts & Eolian Processes. Distribution and causes of dry lands Dry regions cover 30 percent of Earth’s land surface Two climatic types are commonly.

7.3 Landscapes Shaped by Wind

Deserts & Aeolian Processes

Wind. Wind is different than water when it comes to erosion. Why? Wind can carry small materials uphill/upslope.

Wind SWBAT describe conditions that contribute to the likelihood that an area will experience wind erosion; identify wind-formed landscape features; describe.

Landscapes Shaped by Wind

Wind Erosion Glencoe Earth Science.

Arid region geomorphology...

Arid region geomorphology What causes the erosion and deposition? - Wind, Water, and Gravity Arid region geomorphology What causes the erosion and deposition?

© 2007, John Wiley and Sons, Inc. Physical Geography by Alan Arbogast Chapter 18 Arid Landscapes and Eolian Processes Lawrence McGlinn Department of Geography.

Geology 12 Presents Outline: –Chp 14 Mass Wasting (Landslides) –Chp 15 Running Water –Chp 16 Groundwater –Chp 17 Glaciers and Glaciation –Chp 18 Wind.

Geol 202: Physical Geology Organization second lecture: deserts and wind action.

The Oceans. Ocean-Atmosphere Links Exchange of water, carbon dioxide (gases) and heat. Surface currents are driven by atmospheric circulation.

Deserts and Winds Earth, 10e - Chapter 19

Glaciers Glaciers are a part of both the hydrologic cycle and rock cycle Glacier – a thick mass of ice that forms over land from the compaction and recrystallization.

Erosion by Wind How does wind cause erosion? What features result from deposition by wind?

How does wind cause erosion?

Chapter 16 Wind driven erosion.

Ch. 5: Wind & Deserts P

Deserts. Less than 10 inches of precipitation per year Is San Diego considered to be in a desert area?

Deserts. Arid Climates In an arid climate rainfall is 400mm (15.6 in) per year. Evaporation rate _______ precipitation. Thus, both deserts and the extreme.

Deserts and Wind Chapter 19. Distribution and Causes of Dry Lands ▪ What Is Meant by “Dry”? ▪ A dry climate is one where yearly precipitation is not as.

Wind Erosion. Take-Away Points 1.Wind erosion has little effect on solid rock 2.Wind mostly moves loose material 3.Sand dunes depend on strength and steadiness.

Deserts and Wind Chapter 19.

Deserts and Winds Chapter 19

VENTIFACT YARDANG ZEUGEN ROCK PEDESTAL

Arid Landforms.

Deserts Geologic processes in arid climates

Global Dry Climate Distribution

The Work of Wind and Deserts

Wind Erosion & Deposition

Vocabulary Chapter 12 section 2

Chapter 7.2 Deserts.

Stream Bed Erosion Bell ringer: Write the question & the full answer

Eolian Processes Eolian processes refers to erosion or deposition of material due to wind.

Presentation transcript:

Geology 4th edition by Chernicoff & Whitney Chapter 18 Deserts and the Work of Winds Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. What Is a Desert? A region that receives very little annual rainfall and is generally sparsely vegetated A region where the aridity index (ratio of potential evaporation to annual precipitation) is greater than 4.0 Figure 18-2 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Deserts of the World Figure 18-4 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Types of Deserts Subtropical Rain-shadow (orographic) Continental interior Cold-ocean current Polar Figure 18-3 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Types of Deserts Subtropical Rain-shadow (orographic) Continental interior Cold-ocean current Polar Figure 18-5 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Types of Deserts Subtropical Rain-shadow (orographic) Continental interior Cold-ocean current Polar Figure 18-4 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Types of Deserts Subtropical Rain-shadow (orographic) Continental interior Cold-ocean current Polar Figure 18-6 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Types of Deserts Subtropical Rain-shadow (orographic) Continental interior Cold-ocean current Polar Figure 17-25 Copyright © 2007 Pearson Prentice Hall, Inc.

Weathering in Deserts Primarily mechanical weathering Desert varnish Figure 5-8 Figure 18-8 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Desert Processes Stream erosion Stream deposition Wind erosion Wind deposition Figure 18-10 Figure 18-1 Copyright © 2007 Pearson Prentice Hall, Inc.

Stream Erosion in Deserts Arroyos & canyons Pediments Inselbergs Figure 18-9 Copyright © 2007 Pearson Prentice Hall, Inc.

Stream Erosion in Deserts Inselberg formation Figure 18-11 Copyright © 2007 Pearson Prentice Hall, Inc.

Stream Deposition in Deserts Alluvial fans Playa Figure 18-9 Copyright © 2007 Pearson Prentice Hall, Inc.

Stream Deposition in Deserts Playa deposition Figure 18-12 Copyright © 2007 Pearson Prentice Hall, Inc.

The Work of Winds How winds work Figure 18-14 Copyright © 2007 Pearson Prentice Hall, Inc.

The Work of Winds How winds work Figure 18-15 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Erosion in Deserts Deflation Blowouts Deflation basins Abrasion Figure 18-16 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Erosion in Deserts Deflation Abrasion Balanced rocks Ventifacts Yardangs Figure 18-17 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Erosion in Deserts Deflation Abrasion Balanced rocks Ventifacts Yardangs Figure 18-18 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Erosion in Deserts Deflation Abrasion Balanced rocks Ventifacts Yardangs Figure 18-19 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Transport in Deserts Bed load Rolling Saltation Suspended load Figure 18-20 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Transport in Deserts Highlight 18-2 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Deposition in Deserts Bed-load deposition - Sand dunes Figure 18-23 Copyright © 2007 Pearson Prentice Hall, Inc.

Sand Dunes Dune formation Figure 18-22 Copyright © 2007 Pearson Prentice Hall, Inc.

Sand Dunes Dune migration Figure 18-25 Copyright © 2007 Pearson Prentice Hall, Inc.

Sand Dunes Dune migration Figure 18-26 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Sand Dunes Dune shapes Transverse dunes Longitudinal dunes Barchan dunes Parabolic dunes Star dunes Figure 18-28 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Sand Dunes Dune shapes Transverse dunes Longitudinal dunes Barchan dunes Parabolic dunes Star dunes Figure 18-28 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Sand Dunes Dune shapes Transverse dunes Longitudinal dunes Barchan dunes Parabolic dunes Star dunes Figure 18-28 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Sand Dunes Dune shapes Transverse dunes Longitudinal dunes Barchan dunes Parabolic dunes Star dunes Figure 18-28 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Sand Dunes Dune shapes Transverse dunes Longitudinal dunes Barchan dunes Parabolic dunes Star dunes Figure 18-28 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Deposition in Deserts Suspended-load deposition - Loess Figure 18-29 and 18-30 Copyright © 2007 Pearson Prentice Hall, Inc.

Wind Deposition in Deserts Suspended-load deposition - Desert pavement Figure 18-32 Copyright © 2007 Pearson Prentice Hall, Inc.

Reconstructing Paleowind Direction Figure 18-33 Copyright © 2007 Pearson Prentice Hall, Inc.

Copyright © 2007 Pearson Prentice Hall, Inc. Desertification The invasion of desert conditions into formerly non-desert areas Figure 18-34 Copyright © 2007 Pearson Prentice Hall, Inc.

Desertification Natural processes Figure 18-36 Copyright © 2007 Pearson Prentice Hall, Inc.

Desertification Human induced Figure 18-37 Copyright © 2007 Pearson Prentice Hall, Inc.

Desertification Reversing desertification Figure 18-38 Copyright © 2007 Pearson Prentice Hall, Inc.

Extraterrestrial Wind Action Wind features on Mars Figures 18-39 and 18-40 Copyright © 2007 Pearson Prentice Hall, Inc.