Class 7 Environment
Our Changing Earth
Chapter 3
- 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?
- 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
- 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 4.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.
- 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.