NCERT-GEOGRAPHY-CLASS-07-CHAPTER-05

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👉NCERT-GEOGRAPHY-CLASS-7-NOTES👀 

 

Evaporation


  1. Due to the effect of high temperature, 
  2. That is a minimum 27degree C, then water starts to transform into vapour, 
  3. The process is known as evaporation.
Note-
What does it mean that below 27 degrees centigrade the water vapour process is not active? 🤔
That we will study in the upcoming chapters of advanced Geography 👍

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Rain, snow or sleet is an example of?




  • Through the process of precipitation, when the water comes on the land surface in the form of water droplets, it is known as

  1. Rain, and 
  2. If it is coming in the ice form, then it is known as Snow or sleet.

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Water cycle

 

  • The process by which water continuously transforms itself, in a cyclic manner, such as
  1. the water transformation into the vapour, then
  2. condensation,
  3. precipitation, and
  4. Rainfall, snowfall, sleet or Drizzle is known as a process of the water cycle that again restarts with evaporation.

 

The major source of freshwater


  1. Ponds 
  2. rivers 
  3. lakes 
  4. springs and 
  5. Groundwater is the major source of fresh water.

 

Sodium chloride


  • The salt we use in our home cooking, which we get from ocean water/saline water bodies, is known as sodium chloride.

 

Earth is a blue planet.

     


  • As we know, 71% surface area of the Earth's surface is covered by water, which is why the Earth is known as the blue planet.

 

Distribution of available water on Earth in percentage

 



👉NCERT-GEOGRAPHY-CLASS-7-NOTES 👀


 

 Types of ocean water circulation


  • Through the
  1. ocean currents,
  2. tides, and
  3. waves.

 

Sea waves


  • When a blowing wind blows on the Ocean surface, the by-product is sea waves.
  • Discuss in detail in this chapter, click here



👉NCERT-GEOGRAPHY-CLASS-6-NOTES  👀

Tsunami

      


  • Deep in the ocean, when due to

01-Earthquake,

02-volcanic eruption or

03-underwater landslide (most prominent) causes a vertical shift/displacement of large amounts of ocean water, which results in a huge tidal wave known as a Tsunami.

 

Tides

    


  • In ocean water, one of the important vertical movements is called a tide.
However, when the movement of tidal water takes place in a horizontal direction, it is known as a "tidal current".

The major reasons behind tidal motion are:

  1. The gravitational force exerted on the Earth by the Moon and the Sun.

  2. Centrifugal force is generated due to the rotational motion of the Earth–Moon system.

  • Among these forces, the force for tides is because the Moon is much closer to the Earth than the Sun. 

High Tides

 

  • In the tide event, when the ocean water rises to its highest level and covers a large area, it is known as high tide.

 

Low tide

 

  • When the ocean water rises to its minimum level and also covers a small area of shore, it is known as low tide.

 

Spring tide

 

  • In the event of
  1. full moon or the
  2. New moon, as shown in the above image, when the sun and moon are in the same line, a huge amount of gravitational pull is applied on the earth's water, causing the tide of the highest level to be known as a spring tide.


Neap tide

 

  • When the Earth, the Sun and the moon are diagonally in opposite directions, a minimum force of gravitational pull is applied, causing a neap tide.

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Ocean currents

  • The water of the ocean always maintains constant horizontal movement under the influence of

  1. temperature variation,
  2. Earth's rotational force,
  3. salinity difference of ocean water,
  4. gravitational pull, and
  5. wind movement,
  • known as an ocean current.
  • The rest of the information is being provided in the above image.

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