Geography

Our Changing Earth

Question:

Give an account of earthquake preparedness.

Answer:

Earthquake is a natural calamity which we cannot stop. But we can minimise its impact if we are prepared before-hand.
During an earthquake, we should shift to some safe spot. We should hide under a kitchen counter, table or desk against an inside comer or wall. We should stay away from fire places, areas around chimneys, windows that shelter including mirrors and picture frames. Moreover, we should spread awareness amongst our friends and family members.

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Our Changing Earth

Q 1.

Mention the work of ice.

Q 2.

Answer the following questions briefly:
(i)  Why do the plated move?
(ii)  What are exogenic and endogenic force?
(iii) What is erosion?
(iv) How are flood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are ox-bow lakes?

Q 3.

What is a delta?

Q 4.

What do you know about the lithospheric plates?

Q 5.

Name some coastal landforms.

Q 6.

What is a seismograph? [V. Imp.]

Q 7.

Which earthquake is classified as a major earthquake?

Q 8.

How do the lithospheric plates move?

Q 9.

What does the process of erosion and deposition create?

Q 10.

Name the two processes which wear away the landscape.

Q 11.

Define focus' and epicentre'. [Imp.]

Q 12.

Give an account of the work of wind. [V. Imp.]

Q 13.

How are glacial moraines formed?

Q 14.

Give an account of earthquake preparedness.

Q 15.

What is earthquake? What are some common earthquake prediction methods?[V. Imp.]

Q 16.

Name the three types of earthquake waves.

Q 17.

Give reasons:
(i) Some rocks have a shape of a mushroom.
(ii) Flood plains are very fertile.
(iii) Sea caves are turned into stacks.
(iv) Buddings collapse due to earthquakes.

Q 18.

Name the scale on which the magnitude of the earthquake is measured.

Q 19.

What is a volcano?

Q 20.

Where is Victoria Falls located? [Imp.]

Q 21.

Activity
Observe the photographs given below. These are various features made by a river. Identify them and also tell whether they are erosional or depositional or landforms formed by both.
ncert-solutions-for-class-7-geography-social-science-chapter-3-our-changing-earth-5.1

Q 22.

Explain the work of a river.

Q 23.

Name a few rivers of the world that form a delta?