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Some Natural Phenomena

Question

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What is an earthquake? How does it occur?

Solution

Earthquake is the sudden shaking and trembling of the earth. It occurs due to disturbance deep inside the upper layer of the earth's crust. Earthquake is a natural phenomenon, which can be very devastating depending upon its intensity and magnitude.

The uppermost layer of the earth is not made up of a single flat surface. It is made up of different fragments, called plates. These plates are joined with each other at different points and are always in a continuous motion. Sometimes due to collision of these plates or upward or downward motion of these plates, earth starts shaking. Hence, earthquake happens.

The areas falling on the boundaries of these plates are the areas which are the most vulnerable areas for earthquakes. These are called fault zones or danger zones.

Some More Questions From Some Natural Phenomena Chapter

Sometime, a crackling sound is heard while taking off sweater during winters. Explain.

Explain why a charged body loses its charge if we touch it with our hand.

Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?

Suggest three measures to protect ourselves from lightning.

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

Describe with the help of a diagram an instrument which can be used to detect a charged body.

If two pens made of the same material are rubbed against dry hair and brought closer to each other, will they attract or repel each other?

What kind of electric charge gets developed on the glass rod, when it is rubbed with a piece of silk cloth?

What is lightning?

What is the cause of lightning?

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