Rachna Sapra solutions for जिओग्राफी [अंग्रेजी] कक्षा ९ आईसीएसई chapter 7 - Earthquakes [Latest edition]

Japan which lies in the Ring of Fire experiences frequent earthquakes. As it is an island country, it experiences a typical phenomenon which is a result of an earthquake taking place under the ocean. What is this phenomena called?

Which of the following is not a seismic wave?

During the Gujarat earthquake, the maximum destruction took place in the Bhuj district. This means the ______ of the earthquake was located in Bhuj. Choose the correct answer.

Which scale is used by media to describe the intensity of the earthquake?

Identify the instrument shown in the picture.

The ocean around which the ring of fire lies is ______.

About how many tremors of different strength occur every year?

Which one among the following countries does not lie in a seismic zone?

When the tectonic plates slide against each other, their movement forms ______.

Нуроcentre is the other name of ______.

Shear stress is the term associated with ______.

Which of the following is not a human cause of earthquake?

Which seismic waves are most destructive?

The mid oceanic ridge is the site of most of the volcanic eruptions which take place under the oceans. Which type of plate boundary is formed at the crest of the mid oceanic ridge?

The Himalayas are young fold mountains. They have been formed as a result of the movement of two tectonic plates. Which type of plate movement results in the formation of fold mountains?

Assertion (A): Earthquakes are caused due to the release of energy.

Reason (R): The energy travels inside the Earth in the form of seismic waves.

Assertion (A): The most common cause of earthquakes is the movement of tectonic plates.

Reason (R): The tectonic plates are in constant motion.

Assertion (A): The P waves cause the maximum damage.

Reason (R): The amplitude of L waves is the highest.

Assertion (A): About 20% of the earthquakes occur in the Alpine Himalayan mountain belt.

Reason (R): The Alpine Himalayan mountain belt is located at the convergence of tectonic plates.

Assertion (A): Earthquake waves have been an important source of information about the interior of the earth.

Reason (R): Earthquake waves originate from the seismic focus.

Read the passage given below and answer the following questions.

1. Name the two tectonic plates whose convergent boundaries led to the formation of the himalayas.
2. What is the cause of earthquakes that take place under the oceans?
3. Earthquakes and volcanoes go hand in hand. What does this mean?
4. Name two human activities which may cause local earthquakes.

Which instrument is used to record waves generated by an earthquake?

What is seismology?

Define ‘focus and epicentre of an earthquake’.

How many types of waves are generated by an earthquake? Name them.

What is the main cause of earthquake?

Give an example of a quake lake.

Name five countries which are most prone to earthquake.

What is the ring of fire?

Describe if there are any constructive benefits of earthquake. Give example.

Mention the three most seismically sensitive regions of the world.

What is a tsunami?

What causes a tsunami?

What causes an earthquake? Explain.

Name the two types of scales used to measure the earthquakes.

Suggest some preparedness measures against earthquake.

Mention the three types of movements shown by the tectonic plates.

Give the example of three types of plate movements.

Distinguish between primary waves and secondary waves.

Which type of seismic waves are most destructive? Why?

Give any two destructive effects of earthquakes.

Mention the range of mercalli scale.

Mention the range of richter scale.

What is mid-oceanic ridge?

Name any five countries which lie in the ‘Ring of Fire’.

Name any five mountain ranges which belong to the Alpine-Himalayan belt.

Define plate tectonics.