• Answer the following questions.
(1) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(iii) What is erosion?
(iv) How are flood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are ox bow lakes?
Answers
Answer:
1.The movement of molten magma inside the earth causes the plates to move.
2.Exogenic forces: The forces that work on the surface of the earth are called as exogenic forces.
Endogenic forces: The forces that act in the interior of the earth are called as endogenic forces.
3.The wearing away of the landscape by different agents like water, wind, ice, etc. is called erosion.
4.When a river overflows its banks, it results in the flooding of the nearby areas. When it floods, it deposits layers of fine soil and other material called sediments along its banks. This leads to the formation of a flat fertile plains named as floodplains.
5.In deserts, the fast moving winds lift and transport sand from one place to another. When the wind stops blowing, the sand falls and gets deposited in the low hill-like structures. These structures are known as sand dunes.
6.The sea waves deposit sediments along the seashores. This leads to the formation of beaches.
7.As the river enters the plain it twists and turns forming large bends known as meander. Due to continuous erosion and deposition along the sides of the meander, the ends of the meander loop come closer and closer. Eventually, the meander loop cuts off from the river and forms a cut-off lake, known as the ox-bow lakes.
Answer:
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Explanation:
1)The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth's mantle and fit snugly against one another. The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other.
2)Endogenic (or endogenetic) factors are agents supplying energy for actions that are located within the earth. ... Exogenic (or exogenetic) factors are agents supplying energy for actions that are located at or near the earth's surface. Exogenic factors are usually driven by gravity or atmospheric forces.
3)the process of eroding or being eroded by wind, water, or other natural agents
4)Floodplains. A floodplain is an area of land which is covered in water when a river bursts its banks. Floodplains form due to both erosion and deposition. Erosion removes any interlocking spurs , creating a wide, flat area on either side of the river.
5)A dune is a landform, and is a large mass of wind-blown sand. Dunes are most common in deserted environments, such as the Sahara, and also near beaches. An area with dunes is called a dune system. In physical geography, a dune is a hill of loose sand built by aeolian processes or the flow of water.
6)Beaches are wave-deposited accumulations of sediment located at the shoreline. They require a base to reside on, usually the bedrock geology, waves to shape them, sediment to form them, and most are also affected by tides.
7)An oxbow lake is a lake located in an abandoned meandering channel, and hence on a floodplain. Although a simple lunate shape is common, reflecting the fact that single meander loops are typically isolated, there is no requirement that limits a cutoff to a single loop. ... Oxbow Lake.