Presentation on theme: "What is the MAJOR agent of erosion that has shaped Earth’s land surface? Moving water Water moving over land’s surface is referred to as runoff. This may reason."— Presentation transcript:




You are watching: The major agent of erosion that shapes the land surface of earth

1 What is the MAJOR agent of erosion that has shaped Earth’s land also surface? Moving water Water relocating over land’s surconfront is called runoff. This may reason sheet erosion.

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2 The amount of water runoff counts on 5 major factors:The amount of rain an area receives. Vegetation - grasses, shrubs & trees reduce runoff Type of soil - some absorb more water than others Shape of the land – steep slopes have actually even more run-off, which causes more erosion How civilization use the land also – parking lots & crop removal rise run-off

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3 Rills & Gullies Rills are tiny grooves in the soil that thrive larger developing gullies. A gully is a huge groove or channel in the soil that carries runoff after a storm. It moves soil & rocks. Gullies just contain water after it rains.

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4 Streams & Rivers Gullies join together to create a larger channel called a stream. Water continuously flows here and also hardly ever dries up. Small streams might be referred to as creeks or brooks. Small streams circulation together to develop a large stream dubbed a river.

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5 Rill, Gully, Stream Stream Gully erosion in a pasture.Rill erosion at a construction website. Gully erosion in a pasture. Stream

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6 Rivers reason erosion and create valleys, waterfalls, flood levels, meanders and oxbow lakes. Deplace alengthy a river forms alluvial fans and also deltas.

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7 Not all rain water evapoprices or becomes runoffNot all rain water evaporates or becomes runoff. How does water gain underground? Water soaks into the ground, filling openings in the soil and trickling right into cracks & spaces in layers of rock. Groundwater causes which type of erosion? Chemical weathering What acid forms once carbon dioxide & water combine? Carbonic Acid This weak acid can break dvery own limestone that will progressively hollow out pockets in the rock. In time, the pockets construct into huge holes referred to as caves or caverns.

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8 What are stalactites? Calpoint out deposits that hang from the cave’s roof prefer icicles What are stalagmites? Cone-shaped calmention deposits that develop up from the cave floor

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9 Karst Topography A kind of landscape that is developed in a region wbelow a layer of limerock close to the surconfront forms deep valleys, caverns and sinkhole

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10 Erosion by Glaciers

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11 A glacier is any kind of big mass of ice that moves progressively over land Forms in areas wright here even more snow drops than melts. Move slowly on land also and also Shape the land also Glaciers move as a result of the pressure of gravity. 2 types: Continental Glaciers Valley Glaciers Ice Ages – once big parts of Planet were covered through Continental glaciers

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12 Plucking - The process whereby a glacier picks up rocks as it flows across the land also.Abrasion - As a glacier drags the rock alengthy, the land also is gouged & scratched Till - Deposits of sediments left behind as a glacier melts (clay, silt, sand also, gravel, boulders)

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13 Ridge that forms by the till deposited at the edge of a glacierMoraine Ridge that develops by the till deposited at the edge of a glacier Example: Long Island also in NY is a terminal moraine

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14 Kettles Small depressions left in locations when chunks of ice are left in glacial till They fill in through water and also form ponds or lakes Usual in Minnesota

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15 Erosion by Waves Waves shape the coastline with erosion by breaking down rock and also delivering sand also and various other sediment. They erode tough, rocky areas of the coast that jut out simply prefer jagged mountains that are eroded over time.

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16 Deposits by Waves How do waves deposit sediment? as they sluggish dvery own Beaches, spits & obstacle beaches are developed from these deposits.

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17 What is a Spit. A beach that jobs out into the water favor a fingerWhat is a Spit? A beach that jobs out right into the water choose a finger. How do spits form? As an outcome of longshore drift depositing sediments along a coast Sandbars or Barrier Beaches: What are they? Long ridges of sand also Wbelow are they found? They run parallel to the beach.

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18 Landdevelops Created by Wave ErosionSea Cave- Formed as wave action hollows out a cliff.

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19 Landdevelops Created by Wave ErosionSea Arch- They form as soon as a sea cave on either side of a headland also sign up with.

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20 Landforms Created by Wave ErosionSea Stack- They are left standing as soon as a sea arch collapses.

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21 Wind Erosion Faster the air flows, more erosionErodes even more swiftly if wind blows constantly from one direction 2 TYPES OF WIND EROSION ABRASION and also DEFLATION (Removal of fine pposts by wind )

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23 SAND DUNES are ridges of wind deposited sandThe formation of sand also dunes relies on: - amount of sand also - speed & direction of wind - occurrence of vegetation LOESS -Finely textured sediment wind-blvery own long ranges

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