Gr8 - Valley Formation -Week 4 Lesson 1

Valley formation

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​Lesson structure

Starter: Video

Core : Analysing the different valleys and their formation

Exit ticket: Quizzes

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​Lesson objectives

Investigate the formation of different types of valleys in the Arab world

Locate the major valleys in the Arab world

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​Starter

https://youtu.be/f0pkIf2YbS0

THink Pair Share

How are river valleys formed? Explain the 2 ways

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Valley a low area of land between hills or mountains, typically with a river or stream flowing through it.

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​Valleys

Valley - formation Most valleys are formed by erosion of the land surface by rivers or streams over a very long period of time

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​Valley Formation

​Differentiated task

Group 1: Name the two different types of Valleys and give 2 examples

Group 2 : Investigate how rift valleys are formed.

Group 3 : Suggest how valleys can be useful in a society

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Group 1

V Shaped Valleys
V shaped valleys are valleys formed by rivers, they have a V-shaped cross-section and very steep sides. These valleys are usually found near the source of a river due to the presence of a steeper bank, however, they can also be formed downstream.
V-shaped valleys are formed by erosion. The river carries stones and rocks in its water. The force of the water and the grinding of rocks and stones cut down into the river bed to carve out a valley. Over time the valley becomes deeper and wider. The Grand Canyon is a V-shaped valley formed by the Colorado River.
U-Shaped Valleys
A U-shaped valley is the shape left after a valley has been deepened by a glacier. The original V-shaped valley, which would have been made by a river, is widened and deepened after the ice has eroded the sides and bottom of the valley.U-shaped valley which is located in the Sierra Nevada Mountains.

Flat Floored Valleys
The third type of valley is called a flat-floored valley and is the most common type in the world. These valleys, like V-shaped valleys, are formed by streams, but they are usually older, or more developed. As the slope of a stream's channel becomes smooth, and begins to smooth the steep V or U-shaped valley, the valley floor gets wider. 

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A rift valley forms where the Earth’s crust is spreading or splitting apart. This kind of valley is often narrow, with steep sides and a flat floor. 
Many rift valleys have been found underwater, along the large ridges that run throughout the ocean. These ocean ridges are formed as tectonic plates move away from one another. 

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​Group 2-Rift valleys

Group 3

Importance of Valleys

• They help build a civilization and increase the area of people.

• People get water, rich soils, fish and good water life.

• Rich soils help to grow good quality crops in and around the region of valleys.

• Rivers give a generous force of water for major agreements.

• It helps to survive better by using essential things.

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Multiple Choice

Rivers can change the land by a process of ...

• refraction

• erosion

• deposition

Multiple Choice

A valley is defined as being ...

• a small river

• flat land

• low lying area

Multiple Choice

Some valleys are caused by ----- and can form ------ shaped valleys.

• erosion .......v shaped

• glaciers .......u-shaped

• wind .....flat shaped

Open Ended

Suggest any 3 uses of valleys