What is a floodplain quizlet geology?
What is a floodplain? a flat surface next to a river channel. What is a natural levee? a ridge of flood deposits next to a river channel.
Class 6
rivers of Asia flood prone?
Heavy rains lead to a rise in volume of the river load, which causes change in river course. As a result of this, water spills over into adjoining areas which are not able to drain this water out and thus get flooded. North Indian Rivers such as Damodar, Kosi, and Brahmaputra are known for their …
How do rivers make the soil fertile?
When a river overflows its banks, the nearby areas get flooded. During the flood, a thin layer of fine soil and silt gets deposited over the land, thereby forming rich alluvial soil which is highly fertile and nutrient-dense for the plants.
What is alluvial plain in geography?
Definition of alluvial plain 1 : a level or gently sloping flat or a slightly undulating land surface resulting from extensive deposition of alluvial materials by running water. 2 : a plain formed by lateral coalescence of alluvial fans a piedmont alluvial plain — compare bajada.
Why do upstream and downstream flooding occur?
In areas where large amounts of rain fall over a short period of time within a small area, streams in the local area may flood, with little or no effect on areas downstream. Such floods are referred to as upstream floods. In such floods, water rises quickly and flows away quickly after the storm has passed.
What is the difference between chemical and physical weathering give an example of each?
Physical, or mechanical, weathering happens when rock is broken through the force of another substance on the rock such as ice, running water, wind, rapid heating/cooling, or plant growth. Chemical weathering occurs when reactions between rock and another substance dissolve the rock, causing parts of it to fall away.
How do chemical and mechanical weathering work together to create sediment?
Mechanical weathering breaks rocks down into smaller pieces. This gives the rock a larger surface area for chemical reactions to take place. Chemical weathering weakens rock, making it easier for it to be broken down by mechanical weathering.
What is the process that deposits sediment soil and rock onto land?
Deposition is the geological process in which sediments, soil and rocks are added to a landform or landmass. Wind, ice, water, and gravity transport previously weathered surface material, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.
What is meant by Exogenic process?
Exogenic processes include geological phenomena and processes that originate externally to the Earth’s surface. They are genetically related to the atmosphere, hydrosphere and biosphere, and therefore to processes of weathering, erosion, transportation, deposition, denudation etc.
What are the examples of Exogenic forces?
What are the examples of Exogenic forces? Exogenic forces include the tidal force of the moon, erosion. Erosion is mostly made by precipitation such as rain and snow, and by the wind cyclones, tornadoes, droughts, thunderstorms, rainfall, snowfall, winds, hailstorms.