Class 7 Exam > Class 7 Videos > Soil Formation and Layers of Soil - Soil - CBSE Class 7 Science
Soil Formation and Layers of Soil - Soil - CBSE Class 7 Science Video Lecture
FAQs on Soil Formation and Layers of Soil - Soil - CBSE Class 7 Science Video Lecture
| 1. What is soil formation? |  |
Ans. Soil formation is the process by which rocks are weathered and broken down into smaller particles, which then mix with organic matter and minerals to create soil. This process takes place over a long period of time and is influenced by factors such as climate, parent material, topography, organisms, and time.
| 2. What are the different layers of soil? | |
Ans. The different layers of soil, also known as soil horizons, are:
1. O Horizon: This is the topmost layer of soil, also called the organic layer. It consists of decomposed organic matter like leaves, plants, and animal remains.
2. A Horizon: Also known as the topsoil, this layer is rich in nutrients and organic matter. It is dark in color and is where most plant roots grow.
3. E Horizon: This layer is characterized by the leaching of minerals and nutrients, as water moves through it. It is lighter in color compared to the other layers.
4. B Horizon: This layer, also called the subsoil, contains minerals and nutrients that leached from the upper layers. It is generally denser and has a lower organic matter content.
5. C Horizon: The lowest layer of soil, it consists of weathered rocks and is relatively unaffected by organic matter. This layer serves as the parent material for the upper layers.
| 3. How does climate influence soil formation? | |
Ans. Climate plays a significant role in soil formation. Temperature and rainfall are two key aspects of climate that affect the rate of weathering and erosion of rocks, which ultimately influence soil formation. For example, in hot and dry climates, chemical weathering is slower, leading to the formation of coarse-textured soils. On the other hand, in wet and humid climates, chemical weathering is more rapid, resulting in the formation of fine-textured soils. The amount and distribution of rainfall also determine the leaching process, where minerals are washed down from upper layers to lower layers.
| 4. What is the role of organisms in soil formation? | |
Ans. Organisms, such as plants, animals, and microorganisms, play a crucial role in soil formation. They contribute to the formation of organic matter through the decomposition of plant and animal remains. The roots of plants help in weathering rocks and contribute organic matter to the soil. Earthworms and other soil-dwelling organisms mix the soil, enhancing its structure and fertility. Microorganisms break down organic matter further, releasing nutrients that are essential for plant growth. Thus, the presence and activities of organisms greatly influence the formation and quality of soil.
| 5. How does time affect soil formation? | |
Ans. Time is a significant factor in soil formation as it takes several centuries or even thousands of years for soil to develop. The longer the time, the more weathering and erosion processes can occur, leading to the formation of deeper and more mature soils. Over time, the accumulation of organic matter, minerals, and nutrients increases, providing a fertile environment for plants to grow. Additionally, soil profiles develop distinct horizons as different processes act on the soil over time. Therefore, time is an essential component in the formation of diverse and productive soils.
Text Transcript from Video
today we will learn about soil what is
soil how is it formed what is its
importance to us we all live on the
planet Earth have you ever thought why
is the life possible on the earth life
is possible on the earth because of air
water sunlight and the soil these are
the necessary elements for the life
so why is the soil necessary soil is
necessary element for the life as all
the plants grow on the soil we know
plants are the primary source of food
for all of us
soil also is the home for many insects
and small animals like the rabbit which
makes burrow or the snake which lives in
holes some houses like that cut your
houses are also made of mud or the soil
apart from this we get many minerals
from the soil such as calcium magnesium
potassium etc but what is the soil
actually how is it formed you sure you
will have this question in mind who can
form such a huge amount of soil let us
see it in detail
millions of years ago the earth was made
up only of rocks there was no soil
hence no plants and no life
slowly the huge rocks brought into small
pieces
due to action of rain frost heat and the
wind
this process of breakdown of you chops
into smaller pieces is called wet leg
whether it takes place as rocks are
broken down into progressively smaller
pieces by the effects of weather
snobby tiny plants and green moss crew
on the broken pieces of the rocks
when these plants died their remains
were added to Rock business and the soil
was formed
whether it continued and the bigger
trees started to grow and slowly the
animal night began on the earth it took
millions of years for the soil to fall
so it forms the top layer of earth the
soil itself is not the same throughout
it also has a lead structure the topmost
layer of the soil is called the top soil
it is very fertile and plants grow in it
below the top soil is the subsoil it is
hard with mostly small rocks below it is
weathered rock fragments where there is
little or no plant or animal life the
bottom most layer is the bedrock which
is the starting stage of the earth
millions of years ago it has only big
rocks in short the soil is a mixture of
broken rocks and minerals living
organisms and the decaying organic
matter let me tell you a small joke can
you guess why did the gardener plant his
money kiss kiss kiss no idea he wanted
the soil to be rich this decaying
organic matter present in the topsoil is
called humors humors is dark soft and
rich in nutrients humors layer which is
a topmost layer of the soil is formed in
millions of years it is very useful as
you can see all plants grow well in this
layer of the soil
soil how is it formed what is its
importance to us we all live on the
planet Earth have you ever thought why
is the life possible on the earth life
is possible on the earth because of air
water sunlight and the soil these are
the necessary elements for the life
so why is the soil necessary soil is
necessary element for the life as all
the plants grow on the soil we know
plants are the primary source of food
for all of us
soil also is the home for many insects
and small animals like the rabbit which
makes burrow or the snake which lives in
holes some houses like that cut your
houses are also made of mud or the soil
apart from this we get many minerals
from the soil such as calcium magnesium
potassium etc but what is the soil
actually how is it formed you sure you
will have this question in mind who can
form such a huge amount of soil let us
see it in detail
millions of years ago the earth was made
up only of rocks there was no soil
hence no plants and no life
slowly the huge rocks brought into small
pieces
due to action of rain frost heat and the
wind
this process of breakdown of you chops
into smaller pieces is called wet leg
whether it takes place as rocks are
broken down into progressively smaller
pieces by the effects of weather
snobby tiny plants and green moss crew
on the broken pieces of the rocks
when these plants died their remains
were added to Rock business and the soil
was formed
whether it continued and the bigger
trees started to grow and slowly the
animal night began on the earth it took
millions of years for the soil to fall
so it forms the top layer of earth the
soil itself is not the same throughout
it also has a lead structure the topmost
layer of the soil is called the top soil
it is very fertile and plants grow in it
below the top soil is the subsoil it is
hard with mostly small rocks below it is
weathered rock fragments where there is
little or no plant or animal life the
bottom most layer is the bedrock which
is the starting stage of the earth
millions of years ago it has only big
rocks in short the soil is a mixture of
broken rocks and minerals living
organisms and the decaying organic
matter let me tell you a small joke can
you guess why did the gardener plant his
money kiss kiss kiss no idea he wanted
the soil to be rich this decaying
organic matter present in the topsoil is
called humors humors is dark soft and
rich in nutrients humors layer which is
a topmost layer of the soil is formed in
millions of years it is very useful as
you can see all plants grow well in this
layer of the soil
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Nov 14, 2024 Last updated |
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