Water (Oceans)
EXERCISES
1. Multiple choice questions.
(i) Identify the element which is not a part of the hydrological cycle
(a) Evaporation (c) Precipitation
(b) Hydration (d) Condensation
Answer:
(ii) The average depth of continental slope varies between
(a) 2–20m (c) 20–200m
(b) 200–2,000m (d) 2,000–20,000m
Answer:
(iii) Which one of the following is not a minor relief feature in the oceans:
(a) Seamount (c) Oceanic Deep
(b) Atoll (d) Guyot
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(iv) Salinity is expressed as the amount of salt in grams dissolved in sea water per
(a) 10 gm (c) 100 gm
(b) 1,000 gm (d) 10,000 gm
Answer:
(v) Which one of the following is the smallest ocean:
(a) Indian Ocean (c) Atlantic Ocean
(b) Arctic Ocean (d) Pacific Ocean
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2. Answer the following questions in about 30 words.
(i) Why do we call the earth a Blue Planet?
Answer:
(ii) What is a continental margin?
Answer:
(iii) List out the deepest trenches of various oceans.
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(iv) What is a thermocline?
Answer:
(v) When you move into the ocean what thermal layers would you encounter? Why the temperature varies with depth?
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(vi) What is salinity of sea water?
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3. Answer the following questions in about 150 words.
(i) How are various elements of the hydrological cycle interrelated?
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(ii) Examine the factors that influence the temperature distribution of the oceans.
Project Work
(i) Consult the atlas and show ocean floor relief on the outline of the world map.
(ii) Identify the areas of mid oceanic ridges from the Indian Ocean.
Answer: