NCERT-GEOGRAPHY-CLASS-07-CHAPTER-05
Evaporation
- Due to the effect of high temperature,
- that is a minimum 27degree C then water transforms into vapour,
- the process is known as evaporation.
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 then it is known as
- Rain, and,
- 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
01- the water transformation in the vapour, then
02- condensation,
03- precipitation, and
04-rainfall which is snowfall is known as a process of water a cycle that again restarts with evaporation.
The major source of freshwater
- Ponds
- rivers
- lakes
- springs and
- 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 Earth is covered by water that's why Earth is known as the blue planet.
Distribution of available water on earth in percentage
Types of ocean water circulation
- Through the
01- ocean currents,
02- tides, and
03- waves.
Sea waves
- When a blowing wind does friction on the Ocean surface, the by-product is sea waves.
Tsunami
- Deep in the ocean, when due to
01-Earthquake,
02-volcanic eruption or
03-underwater landslide causes to shift/displacement of large amounts of ocean water which results in a huge tidal wave known as Tsunami.
Tides
- On our earth two types of gravitational influence are active.
01-Sun, and of
02-Moon
- So rhythmic rise and fall of ocean water, under the gravitational influence twice in a day, is called a tie.
High tide
- In the tide event when the ocean water rises to its highest level and covers a large area known as high tide.
Low tide
- When the ocean water rises to its minimum level and also covers a small area of shore known as low tide.
Spring tide
- In the event of
01- full moon or the
02-New moon, 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 Sun and the moon are diagonally in opposite directions, a minimum force of gravitational pull is applied, causing neap tide.
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Ocean currents
- The water of the ocean always maintained constant movement under the influence of
01- temperature variation,
02- Earth rotational force,
03- salinity difference of ocean water,
04- gravitational pull, and
05- wind movement, known as an ocean current.
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