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SOIL-LAYERS OF SOIL

SOIL-LAYERS OF SOIL

Assessment

Presentation

Social Studies

4th - 6th Grade

Practice Problem

Easy

Created by

Geetika Sharma

Used 23+ times

FREE Resource

12 Slides • 8 Questions

1

SOIL FORMATION AND COMPOSITION

by Geetika Sharma

2

Poll

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Do you feel that soil is an important natural resource and we all directly or indirectly depend on soil?

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  • What is soil?

  • ​Soil is an important natural resource.

  • Complex mixtures of minerals, water ,air and organic matter.( Humus)

  • How it is formed?

  • ​Soil is formed by breaking up of rocks.

Our Previous Knowledge- What do we already know?

4

​Learning Outcomes

Students will be able to

​1. Learn about the four main components of soil.

​2. Identify organic and inorganic matter of soil.

​3. Understand the formation and layers of soil.

Learning Objectives

​1. Four main components of soil

​2. Organic and Inorganic matter of Soil.

​3. Formation of Soil

​4. Layers of Soil

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Soil is made up of FOUR components:

  • In Organic ​Mineral matter (45%)

  • Organic material (5%)

  • Water (25%)

  • Air (25%)

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6

​Soil Consists of....

  1. Inorganic Mineral Matter- ROCKS

    Gravel

  2. Stone

  3. Sand

  4. Clay

  5. ​Silt

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  1. Organic Matter

    Humus​

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    Clay

  1. Feels sticky

  2. Yellow/red in color

  3. Poor drainage

  4. SMALLEST particle size

  5. Usually found in Plateaus

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Sand

  1. Feels gritty

  2. More of a gray or white color

  3. Poor fertility (roots can't grip; not enough water or humus)

  4. LARGEST particle size.

  5. ​​Usually found in Deserts

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  1.      Silt

    Feels soft/smooth

  2. Brownish/black in color

  3. Larger than clay,

  4. but smaller than sand

    It is very fertile

  5. In India it is mostly found in northern plains.​

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​Humus

  1. ​It is an organic matter made up of waste from animals and dead leaves/plants which help us to make the soil fertile.

  2. ​We can add humus to inorganic mineral soil to make it more fertile.

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​LAYERS OF SOIL

  1. O horizon-humus on the ground surface.

  2. ​A horizon - Top Soil, rich in organic material.

  3. ​B horizon -Subsoil, less organic material than topsoil, we can find deep root of plants in this zone.

  4. C horizon- Parent material​ , slightly weathered rocks, no organic matter.

  5. R horizon-Bedrock​ , Unweathered rock material.

12

Poll

ARE YOU READY TO TAKE THE QUIZ ?

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​EXIT CARD

​READ THE QUIZ QUESTIONS CAREFULLY AND TICK THE CORRECT ANSWER.

​TIME- 30 SECONDS FOR EACH QUESTION

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14

Multiple Choice

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This soil is gritty ,cannot hold water and has poor fertility.  identify the soil.

1

Sand

2

Silt

3

Humus

4

Clay

15

Multiple Choice

What is a soil horizon?

1

a factor influencing how soil is formed

2

a technique used to map soils

3

a layer of soil

4

an organism found within soil

16

Multiple Choice

Which three layers form the soil profile?

1

air, water, and soil

2

minerals, organic matter, and living organisms

3

clay, silt, and sand

4

topsoil, subsoil, and parent material

17

Multiple Choice

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How does a silt soil feel to the touch?

1

Smooth and Light

2

Gritty

3

Sticky

4

Rocky

18

Multiple Choice

Why is organic matter (humus) an important part of soil?

1

It helps to improve water infiltration.

2

It can break down organic pollutants

3

It converts nitrogen in the air into nitrates used by plants.

4

It is rich in nutrients, which is important for fertility

19

Multiple Choice

Which of the following is the horizon in which we find the partially weathered rocks?

1

Parent Material

2

Bedrock

20

HOME TASK

​DRAW A WELL LABELLED DIAGRAM OF LAYERS OF SOIL IN YOUR NOTEBOOK.

THANK YOU :)

SOIL FORMATION AND COMPOSITION

by Geetika Sharma

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