Some Natural Ph...

Which natural calamity cannot be predicted accurately in advance?

What are the weak zones that are present around the boundaries of plates underneath the earth and cause slides and earthquakes commonly known as?

On which of the following scales is the magnitude of an earthquake measured?

In which of the following states is an earthquake most likely to occur?

Which of the following is caused by electric sparks?

According to the law of electrostatics,

Which of the following is/are affected during lightning?

How is lightning useful to us?

What happens when water vapour changes to liquid in the form of rain drops?

Which of the following statements is NOT true?

Which of the following makes the outermost layer of the earth fragmented?

Earthquakes at two places M and N were measured as 2 and 4. How is the magnitude and their destructive energy at M and N related?

Where is the crust of the earth the thickest?

Which of the following events can cause an earthquake?  

(i) Movement of earth's plates
(ii) Volcanic eruption
(iii) Underground nuclear explosion

On what factors does the response of the rock to stress depend?

(i) Its temperature
(ii) The speed of stress applied
(iii)  The confining pressure on the rock