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3/12 – Today you have a test! Get out your notes and study!. DSQ #3 – What do deltas, bars, and sand dunes all have in common?. Lets Review!. What is the difference between a u-shaped valley and a v-shaped valley?. U – Shaped is made by glaciers. V-shaped is made by rivers. Rill – Smallest
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3/12 – Today you have a test!Get out your notes and study! DSQ #3 – What do deltas, bars, and sand dunes all have in common?
Lets Review! • What is the difference between a u-shaped valley and a v-shaped valley?
Rill – Smallest • Gully – Next smallest • Stream – Larger • River Largest
Abrasion • A form of erosion that results in pitted or smoothly polished rocks.
Where is chemical weathering more rapid? • In moist, warm air
What do deltas, bars, and sand dunes have in common? • They all are created because sediment accumulates.
What is a delta? • A landform created when sediment accumulates in large amounts at the mouth of a river.
Mechanical Weathering • Animals • Ice wedging (freezing and thawing) • Plant roots • NOTICE: Sunlight DOES NOT cause weathering!
Chemical Weathering • Acids • Oxidation (When iron is exposed to water and oxygen)
Canyons • Formed by streams (water)
AND • WATER IS THE MOST IMPORTANT AGENT OF EROSION!
Rock Flour • A fine powder left behind when GLACIERS scrape rock.
SOIL • A mixture of organic matter, weathered rock, air, and water. • It is affected by organisms, parent rock type, and climate.
Deflation • WIND picks up small sediment and leaves behind larger sediment.
LOESS • Silt that is carried by the wind then deposited
MASS MOVEMENT • Creep – slowly moves downhill • Mudflow – sediment mixes with water • Slump – along a curved surface • Rockslide – break loose and fall