Soil Formation
Overview
Every crop a farmer grows draws its life from a thin skin of soil, yet that soil did not appear overnight. It is the slow product of solid rock being broken down over hundreds or thousands of years by the weather, by water and air, and by living things. Understanding how soil is made helps a farmer see why some land is deep and rich while other land is shallow and stony, and why soil is a resource that must be protected rather than taken for granted.
In this lesson you will learn what parent material is and how the three agents of weathering, physical, chemical and biological, attack it to release the mineral grains that form the skeleton of soil. You will see how plants, animals and humus then turn weathered rock into a living topsoil, and you will be able to explain soil formation in the clear, ordered way that the 0600 exam rewards.
Objectives
- (a) explain soil formation from parent material by physical, chemical and biological agents of weathering.
Lesson Note
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Lesson Evaluation
Congratulations on completing the lesson on Soil Formation. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The rock from which the mineral part of a soil is formed is called the: A. Humus B. Parent material C. Subsoil D. Topsoil Answer: B
- Which of these is an example of physical weathering? A. Acid rain dissolving limestone B. Roots producing acids C. Freeze-thaw splitting rock D. Bacteria releasing nutrients Answer: C
- Chemical weathering of rock is caused mainly by: A. Wind-blown grains rubbing the surface B. Weak acids and oxygen reacting with minerals C. Earthworms mixing fragments D. Heating and cooling of the surface Answer: B
- Dark, decayed organic matter that makes topsoil fertile is called: A. Clay B. Silt C. Humus D. Bedrock Answer: C
- Breaking rock into smaller pieces speeds up weathering mainly because it: A. Increases the surface area exposed to air and water B. Adds nutrients to the rock C. Removes humus from the soil D. Lowers the temperature of the rock Answer: A
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
Want to practice mock questions on Soil Formation? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in JAMB, WAEC & NECO
