PPT-- Rocks lying on the desert floor that have been shaped by the wind (abrasion)

They have sharp edges and smooth sides They may have more than one smoothed edge if there is more than one wind direction or they get moved by the wind Large amounts of sand are removed by deflation leaving a hollow. What is so important about understanding how these sedimentary rocks look the way they do?. Bedding, no it has nothing to do with where you sleep. Virtually all sediments clastic or chemical are deposited in layers. This can be their most prominent characteristic.. 21:. DESERTS AND WIND. A desert is a . region that . receives less than 25 cm of precipitation per year.. What is the annual precipitation in your region?. Life Support. Vegetation is so sparse, and water so rare, that a desert is unable to support significant populations of animals.. Weathering . Students will be able to describe and give examples of chemical and physical weathering.. . Weathering. The breakdown of materials on Earth’s crust into smaller pieces.. Two Types of Weathering. VINYL SHEETING_. INTRODUCTION_. BENEFITS_. RANGES_. SUGGESTED SPECIFICATION_. INSTALLATION INSTRUCTIONS_. MAINTENANCE PROCEDURES_. TECHNICAL PROPERTIES_. . Eternal . Vinyl Sheeting. Eternal is a compact heterogeneous vinyl floor covering with a calendared backing in 2m wide sheeting that meets the class T requirement of EN 660-2 for abrasion resistance.. Eolian. Processes in Arid Zones. Global Distribution of Arid/Desert . and Semi-arid/Steppe Regions. Types of Deserts. Erg . – Sea . of . Sand. . Largest . are in Sahara and Arabian . Deserts . Sand covers . and identify . slow changes . to Earth’s surface caused by weathering, erosion, and deposition from water, wind, and ice. . 1. A . student placed some clean rocks in a clear plastic jar. The jar was filled with clean water and covered with a lid. Then the student shook the jar for five minutes. The student noted that smaller pieces had broken off some of the rocks and that there was a fine grit on the bottom of the jar. Which change of Earth’s surface was the student modeling?. Deserts Adiabatic Warming and Cooling Warm, moist air masses forced up and over mountains experience decreasing atmospheric pressure and, as a result, expand. This process causes the expanding air mass to release a portion of its latent heat, resulting in a decrease in air temperature. This is called adiabatic cooling. Depending on the height to which the air is forced the air mass temperature may drop below the dew point, resulting in the formation of water droplets and precipitation in the form of rain or snow. As a result, when the air mass reaches the summit, it is cold and dry. Crossing the summit, the air mass descends and compresses. This produces a corresponding increase in atmospheric pressure and, as descent continues, the compressing air mass begin to warm. This is a called adiabatic warming. However, because the moisture was released during the cooling stage, the descending air mass is warm and dry. If sufficient moisture is removed the descending air mass could be dry enough to create a rain shadow effect where precipitation is much lower than surrounding areas. In some cases a rain shadow desert can form. Deserts & Winds: Fluvial and Eolian Processes in Arid Zones Why Do Deserts Exist? Desert – any spot on Earth that receives less than 25 cm (10 in) rain per year Semi-desert – 25-50 cm (10-20 in) Deserts Adiabatic Warming and Cooling Warm, moist air masses forced up and over mountains experience decreasing atmospheric pressure and, as a result, expand. This process causes the expanding air mass to release a portion of its latent heat, resulting in a decrease in air temperature. This is called adiabatic cooling. Depending on the height to which the air is forced the air mass temperature may drop below the dew point, resulting in the formation of water droplets and precipitation in the form of rain or snow. As a result, when the air mass reaches the summit, it is cold and dry. Crossing the summit, the air mass descends and compresses. This produces a corresponding increase in atmospheric pressure and, as descent continues, the compressing air mass begin to warm. This is a called adiabatic warming. However, because the moisture was released during the cooling stage, the descending air mass is warm and dry. If sufficient moisture is removed the descending air mass could be dry enough to create a rain shadow effect where precipitation is much lower than surrounding areas. In some cases a rain shadow desert can form. Presented by. Ademeso. , . Odunyemi. . Anthony,. Adekunle. . Ajasin. University, Nigeria. to the. 2012 Meeting of the Geological Society of America. at. The Charlotte Convention Centre,. Charlotte, North Carolina, USA. Lecture 3. collected. . by :. Maher . M Mahdi . Global wind system. Wind has been important agent in shaping the landscape at times when the continents were drier and windier places than they are today.. River erosion. River erosion also happens by the load carried on the river channel itself.. The erosion rate varies with different volume and velocity.. C. orrasion (abrasion). A. ttrition. S. olution (corrosion). Section 4. Standard . S 6.1 Students know evidence from plate tectonics is derived from the fit of the continents and mid ocean ridges. . Vocabulary. Mid-ocean ridges. Sonar. Sea floor spreading. Deep ocean trench. 78. th. GRBP. Informal . Document GRBP-78-32. 78th GRBP, 30 Aug – 01 Sept 2023. Agenda Item 7e. Submitted by OICA. CONTENTS. 2. Tyre Abrasion Study Overview. WP1 – Literature Review. WP2 – EPREL Tyre Database Analysis.