This chapter deals with the concept of acids and bases. We study how to categorize the substances into acids and bases with some activities and experiments. We learn about acid rains and salts. It also explains the uses of acids, bases and salts.
In this chapter, we will study the different animal fibres such as silkworm, sheep, goat and many more through the stories. It describes the life cycle of the silkworm. We will also go through the flow chart of the production of woollen fabric.
All living things need water to survive. This chapter discusses how much water we use, source of water, water cycle, back to the oceans, what if it rains heavily, how we can conserve water and many factors related to it.
The concept of soil and the importance of soil in our life are discussed in this chapter. It describes the soil life chart and the diagram of different types of soil. We will also study the soil horizons and conservation of soil through the activity.
This chapter explains the different changes that we notice around us in our daily life. These include phenomena such as milk turning to curd, liquid changing to gas and vice versa and changing seasons. The concepts are explained in a lucid manner.
