There are so many natural phenomena, on which we humans have no control. These phenomena cause loss of lives, money, buildings, houses, materials, etc. Through NCERT Solutions for Class 8 Science Chapter 15 some natural phenomena, you will be able to get knowledge about destructive natural processes such as lightning and earthquakes. You will study about various aspects of these phenomena like how they are caused, what instruments are used to measure the magnitude of these processes and what measures you should take to save yourself from lightning and earthquakes. NCERT Solutions for Class 8 Science Chapter 15 some natural phenomena mainly deals with details of two natural phenomena lightning and earthquakes.
(i). Lightning occurs due to the accumulation of electric charges in the clouds. Since lightning is due to electric discharge, understanding of basics of charge transfer is important. The concept of charge transfer is explained in NCERT grade 8 chapter 15. There are two types of charges i.e. positive charge and negative charge. The like charges repel each other whereas unlike charges attract each other. To make you understand about properties of charges and transfer of charges, there are simple activities mentioned in NCERT Solutions for Class 8 Science Chapter 15 some natural phenomena.
The above figure is of a lightning rod which protects from the lightning strike. It is mounted on top of the building. The rod will be of metals. When lightning strikes the building it will preferentially strike the metal rod (since metals are good conductors) and be conducted to ground through a wire. The same you will study in NCERT grade 8 chapter 15
(ii) Earthquake refers to sudden trembling in Earth’s surface caused due to disturbances deep down in the core of Earth. The major reason for the earthquake is the movement of tectonic plates. Now, what are tectonic plates and how their movement causes earthquake will be studied in NCERT Solutions for Class 8 Science Chapter 15 some natural phenomena. This chapter also has details about how we can protect ourselves during earthquakes. Understanding of this chapter is not only important for exam purpose but it has real practical importance also. Thus, learning this chapter will be an experience.
The NCERT Class 8 science chapter 15 some natural phenomena cover various topics and sub-topics. These topics are as follows 15.1 Lightning
15.2 Charging by Rubbing
15.3 Types of Charges and Their Interaction
15.4 Transfer of Charge
15.5 The Story of Lightning
15.6 Lightning Safety
Once you have gone through this basic introduction of lightning and earthquakes, you can attempt solving the NCERT exercise class 8 science chapter 15 some natural phenomena. The NCERT exercise includes simple questions directly from the NCERT science chapter 15. You can refer to the following examples that are important from exam point of view.
Q. What causes disturbances inside the Earth?
Ans. The outermost layer of the Earth is fragmented and each fragment is called a plate. These plates are in continual motion. When these plates brush past one another, or one plate goes under other due to a collision, disturbances are caused inside the Earth.
NCERT solutions for class 8 science chapter 15 some natural phenomena.
For the preparation of this chapter, you must have NCERT solutions for class 8 science chapter 15 some natural phenomena.
3. Write T against true and F against false in the following statements.
(a) Like charges attract each other (T/F)
(b) A charged glass rod attract a charged plastic straw (T/F)
(c) Lightning conductor cannot protect a building from lightning (T/F)
(d) Earthquakes can be predicted in advance (T/F)
5. Explain why a charged body loses its charge if we touch it with our hand.
8. Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?