NCERT Class 8 Science Chapter 15: Some Natural Phenomena | English | CBSE (NSO/NSTSE)

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Dr. Manishika Jain explains NCERT Class 8 Science Chapter 15: Some Natural Phenomena – Thunderstorm, Lightning



SOF NSO Class 8 –

Unified Council NSTSE Class 8 Preparation –

Handouts @

Thunderstorm and Lightning
Electric charge and Electric Current
How Lightning Conductor protect a building?
If a thunderstorm occurs there is always a possibility of lightning and cyclones accompanying it.
A major earthquake occurred in India on 8 October 2005 in Uri and Tangdhar towns of North Kashmir. Before that a major earthquake occurred on 26 January 2001 in Bhuj district of Gujarat.
An earthquake is a sudden shaking or trembling of the earth which lasts for a very short time
Earthquakes can cause floods, landslides and tsunamis. A major tsunami occurred in the Indian Ocean on 26 December 2004.
Pacific Ring of Fire
The outermost layer of the earth is not in one piece. It is fragmented. Each fragment is called a plate. These plates are in continual motion – convergent, divergent and transform fault
Tremors on the earth can also be caused when a volcano erupts, or a meteor hits the earth, or an underground nuclear explosion
The weak zones are also known as seismic or fault zones. In India, the areas most threatened are Kashmir, Western and Central Himalayas, the whole of North-East, Rann of Kutch, Rajasthan and the Indo–Gangetic Plains. Some areas of South India also fall in the danger zone.
The power of an earthquake is expressed in terms of a magnitude on a scale called the Richter scale. Earthquake intensity measured by Mercalli scale
Seismograph – tremors produce waves on the surface of the earth

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Natural Phenomena @0:08
Lightning & Thunderstorm @0:29
Availability of Moisture @1:33
Unstable Atmosphere @1:38
Lifting Mechanism @1:45
Electric Charge @3:04
Charge Separation @3:14
Charge Objects @5:01
Electric Current & Electric Charge @6:46
Electroscope @7:47
Lighting Conductor @8:12
Positive & Negative Lightning @10:31
Thunderstorm – Precautions @11:34
Earthquakes @13:46
Intensity @15:59
Magnitude @16:04
Protection against Earthquakes @16:25
#Precautions #Earthquakes #Electroscope #Static #Lifting #Mechanism #Moisture #Availability #Phenomena #Thunderstorm #Manishika #Examrace

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