SUBJECT: AGRICULTURAL SCIENCE
CLASS: PRIMARY 4
TERM: 1ST TERM
TOPIC: FORMATION OF SOIL
At the end of this lesson, Pupils should be able to know:
The Agents of soil formation.
How soil is formed
ENTRY BEHAVIOUR/ PREVIOUS KNOWLEDGE: Pupils are familiar with the characteristics of types of soil.
Universal Basic Education Curriculum.
NERDC Basic Education Curriculum for Primary Schools.
Unified Schemes of Work Primary Schools four Agricultural Science (MIDDLE BASIC)
Lagos State Agricultural Science Scheme of Work
Agricultural Science for Primary Schools.
FORMATION OF SOIL
Soil formation show us how soil is formed. Soil is formed when rocks break down into smaller particles. It can also be called Weathering. This happens as a result of the following Agents.
Agents of soil formation
The agent of soil formation is:
When rain falls, it touches the rocks which tears out tiny pieces of rocks. The water from the rain will wash these pieces of rock to form soil
High temperature makes rock to expand, crack and break down into small pieces. It is cause by hot sun or heat
When heavy wind blows, it will blow away small pieces of rocks from the large ones which creates more room for loose rock to fall which later turn to soil.
Man help in soil formation when he/she make use of some farm tools like hoe on rocky areas, he try to break the little rocks or stones which later turn to soil. Man splitting firewood on the rock or breaking objects on the rock leads to soil formation.
When huge animal like cattle’s, elephant walk on a rocky place, it breaks the rock into smaller pieces thereby forming soil. Also when animal dies their body decays and mixed with the soil.
As plant keeps growing, the root of the plants keep expanding and getting strong on the ground. Like the root of trees breaks down rock particle during expansion and growth. Also when plants die their body decays and mixed with the soil.
THE PROCESS OF SOIL FORMATION
The decomposition and dissolution of rocks through weathering and with the help of soil organisms like earthworm. Bacteria, fungi, protozoa and the help of chemical substances in the soil bring about soil formation
The Teacher revises the previous lesson (CHARACTERISTICS OF TYPES OF SOIL).
The Teacher introduces the topic (SOIL FORMATION).
The Teacher explains the lessons.
Learners participate in the class discussion
Learners observe some rock samples
Mention three agent of Soil formation.
How is soil formed?
CONCLUSION: the teacher summarizes the lesson.
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