Consult the atlas and show ocean floor relief on the outline of the world map.

Multiple choice question.

Which one of the following is the smallest ocean:

Answer the following questions in about 30 words.

(i) Why do we call the earth a Blue Planet?

(ii) What is a continental margin?

(iii) List out the deepest trenches of various oceans.

(iv)What is a thermocline?

(v) When you move into the ocean what thermal layers would you encounter?

Why the temperature varies with depth?

(vi) What is salinity of sea water?

Answer the following questions in about 150 words.

(i) How are various elements of the hydrological cycle interrelated?

(ii) Examine the factors that influence the temperature distribution of the oceans.

Identify the areas of mid oceanic ridges from the Indian Ocean.