Chemistry

The chapter discusses fibre and its types. It explains how the fabrics are made from fibres. The various methods are discussed. It also states the evolution of clothing since olden times.

This chapter explains the concepts of acids, bases and salts. It describes the various reactions of acids, bases and salts. Moreover, it explains the various examples and uses of important salts which are used in everyday life.

This chapter discusses the physical and chemical changes such as sugar getting dissolved in water when preparing a cold drink, milk changing to curd, etc.

This chapter discusses soil and its properties. We will learn that soil provides nutrients and water to the plants. Many organisms live in the soil. It is also important for agriculture as it provides food and shelter to all living organisms.

This chapter sheds light on the various sources of water. We will study the water cycle and factors affecting the height of the waves. The concept of ocean currents is explained here. Furthermore, distribution and depletion of water is given here.

This chapter describes the water that gets wasted. Water gets wasted due to many reasons. Water which is mixed with oil, rich in lather, black-brown water that goes down the drains from sinks, toilets, etc., are considered as waste water.