The document discusses soil formation and types of soil. It explains that soil is formed through processes like physical weathering, chemical weathering, and biological weathering which break down rocks. There are three main types of soil - sandy soil which is light and drains quickly, clayey soil which is dense and retains water, and loamy soil which is a mix and balances the properties. Soil has various uses including in agriculture, pottery, medicine, and building.

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Soil – Process of soil formation Class 7 Science
This worksheet is for Class 7 Science, comprising the topic of Soil. It will help
students develop a better understanding of Soil.
With worksheet completion, students can easily comprehend the following:
1. List some processes of soil formation.
2. List some types of soil.
3. List some uses of soil.
1. What are the factors responsible for soil formation? (List some processes of soil
formation.)
Soil gets generated when rocks disintegrate due to weathering and natural
erosion. The qualities of soil get determined by the conditions in which it
weathers.
Some of the essential procedures are as follows:
 Physical Weathering: Changes in temperature or pressure, or both, are induced by
physical forces such as the sun, wind, and ice, which increase or reduce the volume
of rocks, causing them to disintegrate.
 Chemical Weathering occurs when various chemical components, such as rainfall,
react with the minerals in the rocks to generate new minerals or salts.
 Biological Weathering: Living creatures such as plants, animals, and other microbes
carry out this process by secreting or releasing acids that destroy the rocks. The
foundation aims to drive holistic community initiatives in India to help address some
of the persistent social challenges in the realms of health & nutrition, water &
sanitation, education, skill development, sustainable livelihood & women
empowerment, environment & agriculture, sports, art & culture, rural infrastructure,
and social inclusion.
2. List some types of soil.
There are three basic types of soil:

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 Sandy Soil: This soil is warm, light, dry, and often acidic and has minimal nutritional
constituents. Their size varies in diameter (0.2 mm-2.0 mm). Because they have a
larger amount of sand than clay, they are also known as light soils. They are
effortless to deal with and have faster water drainage, and the nutrients are carried
away by rain only due to this. On the other hand, additional organic matter can
help plants grow faster.
 Clayey Soil: This is a heavy soil type with many nutrients. During the winter, they are
damp and chilly, while during the summer, they are dry. This soil has more than 25
clay particles, and the gaps between them store water. As a result, water drainage
is slow, and it takes longer in the summer to warm up.
 Loamy Soil: This soil is a combination of sand and clay, which helps mitigate the
detrimental impacts of both. Water drainage may be adjusted based on the
proportions of sand and clay. It is easier to deal with this soil, which is why gardeners
appreciate it.
3. List some uses of soil.
Soil’s diverse qualities, as well as its abundance of nutrients, minerals, water, and
microbes, make it helpful in various disciplines.
 Pottery: We combine clay soil with water to manufacture ceramics or pottery. After
letting it dry, it takes its final shape. Vases, bowls, cups, and sculptures are all
examples of pottery.
 Medicine and Beauty Products: Some soil microorganisms aid in the battle against
dangerous bacteria. It gets used to make a variety of skin ointments, antitumor
treatments, and TB medications.
 Agriculture: Soil not only aids in retaining plants but also offers water, air, nutrients,
and correct sustenance to their roots, allowing them to develop and produce.
 Building: Soil gets used for manufacturing red bricks, which then get used in
construction. This dirt is compacted to increase its density, which improves load-
bearing capacity.
1.Fill in the blanks:

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1. Topsoil provides shelter to many organisms like _________ and __________.
2. __________ soil has very little air.
3. When wet, _________ soil is very sticky.
4. For growing crops, ___________ soil is not suitable.
5. ___________ soil lacks humus.
3. State True/False:
1. Clay is the smallest soil particle.
2. C-horizon is the other name of Substratum.
3. The bedrock is made up of microscopic chunks of fractured rock that are devoid of
humus.
4. Sandy soil is best for growing crops.
5. The percolation rate of water is expressed in min/mL.
3. Match the following:
‘A’ ‘B’
Deforestation Red soil
Black soil Floods
Khadar Basaltic rock
Red latosol Alluvial soil
Coffee cultivation Literite soil