Our Changing Earth - Class 7 - Social Science
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Back Questions - Our Changing Earth | Environment | Social Science | Class 7
Why do the plates move?
The lithospheric plates move because of the movement of molten magma inside the earth. This movement is a result of the heat generated from the core, causing convection currents in the magma. These currents carry the plates along very slowly, a few millimeters each year.
What are exogenic and endogenic forces?
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Sign up nowTick 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
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Sign up nowMatch 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 |
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Sign up nowGive 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.
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Sign up nowObserve 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.
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Sign up nowExtra Questions - Our Changing Earth | Environment | Social Science | Class 7
What is the difference between weathering and erosion?
Weathering is the breaking up of the rocks on the earth's surface without moving them. Erosion, on the other hand, is the wearing away of the landscape by different agents like water, wind, and ice, where the eroded material is transported and eventually deposited elsewhere. Erosion represents a more dynamic process, involving the movement of geological materials from one location to another.
How do earthquakes occur?
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Sign up nowHow do sea waves contribute to coastal landforms?
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Sign up nowExplain the significance of loess deposits and their location.
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