Q1 of 10 Page 121

Multiple choice question.

The earth reaches its perihelion in:



The earth is at its perihelion in January, and after half year, it reaches the aphelion, as shown in the figure.

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1

Multiple choice question.

Spring tides are caused:


 1 C

Multiple choice question.

The distance between the earth and the moon is minimum when the moon is in :


 2

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?


 3

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?