Page 99 - Science class 4

Quenching Your Scientific Thirst
Quenching Your Scientific Thirst
Quenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific Thirst
Quenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific ThirstQuenching Your Scientific Thirst
An average soil sample is 45 per cent minerals, 25 per cent water,

25 per cent air, and 5 per cent organic matter. Different-sized mineral
particles, such as sand, silt, and clay, give soil its texture.

Scientific Terms

Burrows : small holes in the soil used to live in by some animals

Excretion : to remove the waste from the body
Humus : the organic constituent of soil usually formed by the
decomposition of plants and leaves by soil bacteria

Mineral salts : a salt containing natural substance like oil, coal etc.
Nutrients : a substance essential for a living thing to live and grow

Chapter at a Glance
³ Soil is a mixture of organic and inorganic matter.

³ Soil is formed from rocks that are the deep layers of the soil.
³ Topsoil, subsoil and bedrock are the different layers of the soil.

³ Gravel soil, sandy soil, clayey soil and loamy soil are the different types of soil.
³ The carrying away of the topsoil by wind and water is called soil erosion.

³ The protection of topsoil from being blown away or washed away is called soil
conservation.

³ We should adopt different methods for conservation of soil such as terrace
farming, growing of grass and trees and building dams or embankments.

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Review and Assesseview and Assesseview and Assess

Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
Based on The Latest Pattern of New Education Policy 2020.
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You And Your Text
You And Your Text
Fill in the blanks with the correct word :
deforestation soil Loamy soil conservation Sandy
1. Plants get water and nutrients from the______________ .