Lakes And Role Of Rivers Video Lecture - Crash Course: Class 9

drainage systems min India lakes in this
module you will learn about lakes as an
important part of the drainage systems
in India Lake is a large depression on
the surface of the earth filled with
water the water of the lakes can be
fresh or brackish however most of the
lakes have fresh water the lakes of very
large size are known as seas some
examples of these are the Caspian Sea
the Dead Sea and the Aral Sea in arid
and semi-arid regions some rivers do not
reach up to the sea they empty their
water into lakes making an inland
drainage system these type of lakes do
not have outlets and they lose water
only through evaporation and underground
sewage this leads to accumulation of
minerals causing the water to become
saline the sambar Lake in Rajasthan is
the saltwater lake in India the lakes
are also formed by glaciers by digging
out hollows and traps on the surface of
the earth which later get filled with
snow water down Lake in the valley of
Kashmir is an example of this type of
Lake are you familiar with the term
lagoons well they're also Lakes lagoons
are formed due to spit and sandbars spit
and sandbars are formed by the
deposition of sand by ocean currents
across the mouths of small bass
therefore we can say that lagoons are
initially parts of an ocean that kept
gradually separated the chilka lake of
Orissa and the pull occurred lake of
Tamil Nadu are examples of lagoons in
addition to the natural lakes there are
artificial water as a voice which are
created by building dams on rivers these
dams are built to generate electricity
from water
an example of a lake formed due to
creation of a dam is the Guru Gobind
sagar lake this lake was formed due to
the construction of the Bhakra Nangal
dam in this module you have learned the
following a lake is a large depression
on the surface of the earth filled with
water lakes of very large size are known
as seas lakes can be classified into two
groups freshwater lakes and saltwater
Lakes due to the movement of plates
inside the earth Earth's crust may sink
relative to the adjacent region this
lead to the formation of a traffic light
Basin which gets filled with water to
form a lake at times glaciers dig out
hollows and traps on the surface of the
earth which later on gets filled with
snow water to form a lake when a river
reaches a low-lying plain in its final
course to the sea or a lake it meanders
widely and leads to the formation of
oxbow lake artificial Lakes or water as
a voice are formed by the dams built on
River for the generation of
hydroelectricity