Multiple choice question.
Upward and downward movement of ocean water is known as the:
Spring tides are caused:
The distance between the earth and the moon is minimum when the moon is in :
The earth reaches its perihelion in:
Answer the following questions in about 30 words.
(i) What are waves?
(ii) Where do waves in the ocean get their energy from?
(iii) What are tides?
(iv) How are tides caused?
(v) How are tides related to navigation?
Answer the following questions in about 150 words.
(i) How do currents affect the temperature? How does it affect the temperature of coastal areas in the N. W. Europe?
(ii) What are the causes of currents?
Visit a lake or a pond and observe the movement of waves. Throw a stone and notice how waves are generated.
Take a globe and a map showing the currents of the oceans. Discuss why certain currents are warm or cold and why they deflect in certain places and examine the reasons.
Prepare a list of currents which are found in Pacific, Atlantic and Indian Oceans.
How is the movement of currents influenced by prevailing winds? Give some examples from Figure14.3.
