Soil Pollution - Natural Resources, Class 9 Science Video Lecture

the third type of pollution can disrupt
both plant and animal life very easily
as it pollutes a very important element
necessary for their survival the element
we are talking about is soil soy is one
of the most important natural resources
that supports the growth of plants by
holding the roots firmly and supplying
water and nutrients it is the home for
many organisms and is essential for
agriculture which provides food clothing
and shelter for all soil is formed by
the breaking down of rocks by the action
of wind water and climate this process
is called weathering the nature of any
soil depends upon the rocks from which
it has been formed and the type of
vegetation that grows in it
soil is composed of various layers these
layers are referred to as horizons a
vertical section through different
layers of the soil is called the soil
profile the uppermost horizon is
generally dark in color as it is rich in
humors and minerals the humans which is
the rotting dead matter in the soil
makes the soil fertile and provides
nutrients to growing plants
single-celled bacteria or even fungi
decompose organic matter to form humors
this layer is generally soft porous and
can retain more water it is called the
topsoil or the a horizon the next layer
has a lesser amount of humors but more
of minerals this layer is generally
harder and more compact and is called
the B horizon or the middle layer
the third layer is the sea horizon which
is made up of small lumps of rocks with
cracks and crevices
the last layer is called the bedrock
this layer is hard and difficult to dig
with a spade and forms the bottom most
and biggest layer of the soil soil is
made up in parts of finely ground rock
particles grouped according to size as
sand silt and clay there is a way to
find out the content of these particles
in a given soil the soil needs to be
placed in a small cylinder then water is
added to it
the top of the cylinder is closed tight
with a rubber band and the cylinder is
shaking vigorously to mix its contents
it is then kept overnight the soil grain
settle based on their size the bigger
particles of sand settle and form a
layer at the bottom then the finer
particles of silt settle in next
followed by the finest of all the clay
particles
if the soil contains create a proportion
of big particles it is called sandy soil
if the proportion of fine particles is
relatively higher then it is called clay
soil if the amount of large and fine
particles is about the same then the
soil is called low me the best topsoil
for growing plants is low low me soil is
a mixture of sand clay and silt silt
occurs as a deposit in riverbeds the
size of the silt particles is between
those of sand and clay the lonely soil
also has humans in it it has the right
water holding capacity for the growth of
plants
different types of soils are found in
different parts of India in some parts
there is clay soil in some parts there
is lonely soil while in some other part
there is sandy soil soil is affected by
wind rainfall temperature light and
humidity these are some important
climatic factors which affect the soil
profile and bring changes in the soil
structure climatic factors as well as
the components of soil determine the
various types of vegetation and crops
that might grow in any region crops such
as wheat are grown in the fine clay
soils because they're rich in humors and
are very fertile
for birdie soils rich in clay an organic
matter and having a good capacity to
retain water are ideal for lentils or
Masoud and other pulses loamy soils
which drain water easily are required
soil pollution that takes place in
general is in the form of soil erosion
soil erosion is the process of
weathering and transport of solids like
sediment soil rock and other particles
in the natural environment it usually
occurs due to transport by wind water or
eyes by downslope creep of soil and
other material erosion of soil is more
severe in areas of little or no surface
vegetation such as desert or bare lands
hence deforestation should be avoided so
to conclude we understand that pollution
is a threat that continues to hover
above our world
birth to this threat it is reallyl who
can put an end to it
you