Physics – Some Natural Phenomena -Important Points

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Some Natural Phenomena



1-Crust -The uppermost layer of the earth is called Crust.

2-Earth’s plates -The outermost layer of the earth is not in one place.It is fragmented.Each fragment is called a plate.These plates are known as earth’s plates.

3-Earthquake-An earthquake is sudden shaking or trembling of earth lasting for very short period of time.

4-Electroscope-A device which detects the presence of charge or measure the magnitude of charhe is called electroscope.

5-Lightning -The process of electric discharge between clouds and the earth or between different clouds causes lightning.

6-Lightning Conductor- It is a device used to protect building from the effect of lighting.

7-Negative Charge -The body which gains electrons is said to have negative charge.

8-Positive Charge -The body which looses electrons is said to have positive charge.

9-Seismograph -The tremors produce waves on the surface of the earth.These are called seismic waves.The waves are recorded by an instrument called the Seismograph.

10-Seismoscope -An instrument that measures the occurance or the time of occurance of an earthquake.

11-Richter Scale -The power of an earthquake is expressed in terms of a magnitude on Richter scale.

12-Thunder -Thunder is the loud noise that you hear from the sky after a flash of lightning, especially during storm.

13-Thunderstorm- A Thunderstorm is a storm in which there is thunder and lightning and a lot of heavy rains.

14-Tremor -The sudden shake of earth is known as tremor.

15-Like Charges repel and unlike charges attract each other.

16-The process of transfer of charge from a charged object to the earth is called EARTHING.

17-Earthing is provided in buildings to protect us from from electrical shocks due to any leakage of electric current.

18-If the intensity of earthquake is less than 3.5 on richter scale then it is not at all felt.

19-If the intensity of earthquake is measuring as 7 or more on Richter scale, it can cause serious damage in areas several hundred kilometers across.

20-By using a)frictional method, b)Conduction method and c)Induction method , we can produce charges.

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