PPT-River erosion The process of wearing away of the rocks on the bed and banks of the river

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. Chapter 7. Section 7.1 Weathering. Weathering is the process by which rocks on or near Earth’s surface break down and change. . Erosion is the removal and transport of weathered material from one location to another.. The . surface. features of the Earth change as a result of observable physical and chemical processes . Weathering and Erosion. This is a monument . called Cleopatra’s . Needle. It was carved in Egypt around 1450B.C. The sides are carved with hieroglyphs, the writing of ancient Egypt. It stood in the dry, hot Egyptian desert for over 3000 years. During that time, the hieroglyphs remained distinct.. Water Erosion. How Does Moving Water Cause Erosion?. Erosion by water begins with a splash of rain.. Some rainfall sinks into the ground.. Some evaporates or is taken up by plants.. The rest of the water runs off over the land surface.. Chapter 4.1. Pages 118-127. Key Questions. How does moving water cause erosion?. What land features are formed by water erosion and deposition?. The GREAT . BLUE. HOLE . p. 118. Where is it located?. formation of landforms. weathering and erosion. The process of weathering and erosion are the main forces behind landscape types. . However, they are not the only reason for a plain, plateau, or a mountain region to form. . Weathering. Weathering is the process that breaks down rock and other substances at the Earth’s surface. . Heat, cold, water, and ice all contribute to weathering.. Repeated freezing and thawing for example can crack rock apart into smaller pieces. . Runoff meander . Rill. oxbow lake turbulence. Gully alluvial fan ice age. Stream delta . River. groundwater. . Tributary. sand dune. Drainage basin . Divide. . abrasion. . Flood . another.. 2 . kinds:. 1) . Rill erosion. is the erosion by running water in small channels. , on the side of a slope.. 2) . Gully erosion. is when a rill channel evolves to become deep and wide.. Weathering:. Rocks that are exposed to air, water, changes in temperature and vegetation become vulnerable to weathering. Weathering is the disintegration (breaking up) and decay (decomposition) of rocks where they are formed. It . Predict how weathering might reshape surface features (topography). Weathering and Erosion. The top part of the lithosphere—the earth’s surface—changes as rocks are broken down to smaller pieces and carried away.. generations.. ‘Bed’ - Themes. 'Bed' is written from the perspective of an elderly invalid who is confined to her bed. The poem uses Scots to add immediacy and expression to her narrative. . The elderly woman relies on her daughter to look after her. She describes her current situation and contrasts it with her past. This gives us an understanding of her relationship with her daughter.. The creation of sedimentary rocks. Weathering and Mass Movement. Objectives:. 1. Describe the processes by which erosion wears down and carries away rock. 2. Distinguish between chemical and mechanical weathering. , Erosion and Deposition. . How can wind and water change our landscapes?. . Weathering- the . destructive processes . by which materials at or near the Earth’s surface are changed in color, texture, composition, firmness or form. . Formation of a Waterfall and Gorge. 2.. Formation of a Waterfall. A waterfall often occurs when a river flows from one rock type onto another. . For example, if the river flows from the harder rock and onto softer rocks because of the vertical movement of rocks along a fault line in the past..