Paheli expresses concern. From her residence, she could see a brick kiln. There were bricks being manufactured there. There was an abundance of smoke emanating from the kiln. She was informed that only the finest clay is suitable for the production of ceramics, sculptures, and bricks. She has seen truckloads of bricks being removed for use in building construction. At this pace, she thinks, there will be no soil left. Are her worries well-founded? Discuss this issue with your parents, teachers, and other subject-matter experts, and write a report. Make an attempt to ascertain the moisture content of a soil sample. A single approach is described here. Take 100g dirt. (Ask any shopkeeper for assistance in weighing the dirt.) Allow two hours for it to dry on a newspaper in the sun. This is a better exercise to undertake in the afternoon. Ensure that no dirt spills outside the newspaper. Weigh the dirt again once it has dried. The weight difference between the soil before and after drying indicates the quantity of moisture contained in 100 grams of soil. This is referred to as the moisture content in percentages. NCERT Science Solved Worksheets for Class 7
Q.1. What is the profile of the soil?
Ans: The vertical strata of soil reveal all of the soil's other layers, collectively referred to as the soil profile. Each layer of the soil profile is subdivided into several horizons, each with its own unique set of features. The different horizons of soil are as follows: (mO) horizon (organic layer), (mA) horizon (topsoil), (mB) horizon (subsoil), (mC) horizon (parent material), and (mR) horizon (parent material) (bedrock).
Chapter 9 of Class 7 Science is titled "Soil." The Chapter defines soil and details the process of soil creation. Students must first comprehend this chapter in order to comprehend plants, since it serves as a foundation. Additionally, students will study about the many kinds of soil and the soil profile. This chapter has a total of 13 questions, ten of which are brief and three of which are lengthy.
