Exercise - Question:

Que: Answer the following questions briefly:

1. Why do the plated move?

2. What are exogenic and endogenic forces?

3. What is erosion?

4. How are flood plains formed?

5. What are the sand dunes?

6. How are the beaches formed?

7. What are the ox - bow lakes?

Ans: 

1. Plates move due to the movement in the molten magma found in the interior of the earth:

• Exogenic Forces

         1. Exogenic forces are those forces which act on the surface of the earth and cause                 changes on the surface of the earth.

              Examples: Weathering, gradation, erosion, deposition.

• Endogenic Forces

          1. Endogenic forces are those forces which originate in the interior of the earth and                    cause change on the surface of the earth.

                Examples: Volcanoes and Earthquakes.

1. Answer the following questions.
(i) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(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?
2. Tick the correct answer.
(i) Which is not an erosional feature of sea waves?
(a) Cliff (b) Beach (c) Sea cave
(ii) The depositional feature of a glacier is:
(a) Flood plain (b) Beach (c) Moraine
(iii) Which is caused by the sudden movements of the earth?
(a) Volcano (b) Folding (c) Flood plain
(iv) Mushroom rocks are found in:
(a) Deserts (b) River valleys (c) Glaciers
(v) Ox bow lakes are found in:
(a) Glaciers (b) River valleys (c) Deserts

Q3. Match the following.
(i) Glacier (a) Sea shore
(ii) Meanders (b) Mushroom rock
(iii) Beach (c) River of ice
(iv) Sand dunes (d) Rivers
(v) Waterfall (e) Vibrations of earth
(vi) Earthquake (f) Sea cliff
(g) Hard bed rock
(h) Deserts
Q4.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) Buildings collapse due to earthquakes.
Q5. 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.