(Solve this worksheet of s.st)
(Class VIIth)
1. Name the two continental glacier.
2. Name the layer of soil which contains humus.
3. Who was Marco Polo?
4. Define Tides
5. Define waves and Ocean currents.
6. What is wet point settlement?
7. Give two advantages of electrification of railways.
8. Define transported soil.
9. What is meant by residual soil?
10. Name the world’s largest and hottest desert.
11. What are huge mounds of sand formed in the desert known as?
12. Kalahari desert is located in _________.
13. What are the factors responsible for permanent settlement?
14. Explain how transportation help in the economic development of a country.
15. Explain three effects of ocean currents.
Answers
Answer:
Q1. Two continental glaciers are - Greenland and Antarctica.
Q2. The topsoil (topmost layer of soil) contains humus.
Q3. Marco Polo was a Venetian merchant, explorer, and writer who travelled through Asia along the Silk Road between 1271 and 1295.
Q4. Tides are the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
Q5. Waves are a disturbance on the surface of the sea or ocean, in the form of a moving ridge or swell. An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences.
Q6. Wet point settlement is the place where the settlements are built close to the water supplies with appropriate dry point measures to avoid excess water in case of floods.
Q7. Electric-powered trains have a number of advantages over diesel engines. They have quicker acceleration, lower fuel costs, produce fewer CO2 emissions and are lighter, meaning they create less wear on tracks.
Q8. Transported soils are those materials that have been moved from their place of origin, by gravity, wind, water, glaciers, or human activity – either singularly or in combination. - The method of transportation and deposition has great effect on the properties of the resulting soil mass.
Q9. Residual soil is the material resulting from the in situ weathering of the parent rock. Residual soils are distributed throughout many regions of the world, such as Africa, South Asia, Australia, Southeastern North America, Central and South America, and considerable regions of Europe.
Q10. Sahara Desert in North Africa is the world's largest and hottest desert.
Q11. The huge mounds of sand formed in desert are known as sand dunes .
Q12. Kalahari Desert is located in South Africa .
Q13.The permanent settlement is dependent upon the physical nature and location of the place. It should be safe with the availability of water, food, shelter, the right quality of soil for agriculture, climate and other resources needed by the people.
Q14. Transportation plays a major role in the economic uplift of a country as it promotes internal and external trade, economic use of natural resources, mobility of skilled labour-force, diversification of markets, provision of fuel, reduction in employment, increase in agricultural and industrial production etc.
Q15.
The following are the three effects of ocean currents:
(i) It keeps the temperature high and makes the area more heated than the surrounding areas.
(ii)The warm ocean currents led to rainfall.
(iii) It shares minerals & pollution attached to it becomes profoundly adulterated & later negligible.
Explanation:
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