Water is essential for life on Earth. It covers about 2/3 of the planet's surface and is found naturally in three states: liquid, gas and solid. Most water on Earth is saline and located in oceans, while only 3% is freshwater found in rivers, lakes, ice caps and underground aquifers. The total quantity of water on Earth remains relatively constant due to the water cycle, in which water evaporates from oceans and land into the atmosphere, condenses into clouds, and falls back to the surface as precipitation.

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lliiffee

2. • In our solar system water in the
liquid form only found in earth
• 2/3 of the earth is covered by
water
• When we look at the earth it is
looks like a blue ball , so it is
called blue planet or watery
planet
• 97% of the water on the earth is
saline
• Pure water contains only 3 % ,

4. BBlluuee ppllaanneett

6. • The amount of water can be directly
used is only 0.33%
• Total quantity of water on the earth
is around 1386 lakh cubic metre
• Saline water found in ocean,
• Pure water found in river lake etc
• It found in gases manner in the
atmosphere

7. Saline water

8. lake

9. • Total volume of water on the earth
is almost constant
• From sea, lake, and from plants get
heated up by sun and finally
evaporates and condensed, as a
result precipitation takes place
• Thus water is always in cyclical
movement and it is called water
cycle, due to this process the
amount water remains constant

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11. • Largest amount of pure water
found in polar ice blocks
• % of pure water found in river
and lakes are 0.26 and 0.0006
• Atmosphere contains about
0.04 %
• 2.5 % of pure water found totally
on the earth

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13. Surface water
• Rivers are the major agent of surface
water
• Land use of the area is largely
determine by the amount of water
flowing through
• River origin from the mountain where
dense forest can be found where water
flow throughout the year
• If river originates from slopes where
plantation or mixed crops can be seen
and the river will be less flow in summer

14. Rivers aarree tthhee mmaajjoorr aaggeenntt ooff ssuurrffaaccee wwaatteerr

15. • Rivers can be divided into two basis on
their flow
• PPeerreennnniiaall rriivveerrss aanndd
• NNoonn ppeerreennnniiaall rriivveerrss
• Rivers that flows throughout the year
called Perennial rivers
• Rain fall and melting of snow are the
major source of these river
• Indus ,Ganges Brahmaputra are
examples

16. • Some perennial rivers are depend
solely on rain , which take its origin
near the equator , where there is
rain fall in almost days in year.
• Amazon, Nile and Congo are
examples
• The only river which cross the
equator twice is the Congo, this
perennial river originates from the
forest of Africa

18. • All the rivers except
Himalayan rivers in India have
lean flow during summer and
regular flow during monsoon

19. • Some part of the area water seeps
into the earth, some area water
dries up quickly but not in paddy
fields
• Factors which influence rate of
seeping are
• Different in the composition of soil
particles
• Topography of the land
• Presence of organic matter

21. • When the water filters from the top soil
inward is called infiltration, if it filters
down due to gravitational pull and
become underground water it is called
percolation
• Water filters through the crack of rocks
also
• There difference in rate of percolation,
depending on the composition of soil

22. •Water infiltrates and get
collected in rock layers
these are called aquifers
• These collected water
finally reach into the rivers
and ponds as underground
water