Geography

Our Changing Earth

Question:

Define focus' and epicentre'. [Imp.]

Answer:

The place in the crust where the movement starts is called the ‘focus'. The place on the surface above the focus is called the epicentre'.

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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 do you know about the lithospheric plates?

Q 4.

What is a delta?

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.

What does the process of erosion and deposition create?

Q 9.

How do the lithospheric plates move?

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.

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

Q 16.

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

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 three types of earthquake waves.

Q 19.

Where is Victoria Falls located? [Imp.]

Q 20.

What is a volcano?

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?