Fill the missing word in the blank spaces in the following statements:
(a) Wind is _______ air.
(b) Winds are generated due to ________ heating on the earth.
(c) Near the earth's surface ________ air rises up whereas _________ air comes down.
(d) Air moves from the region of __________ pressure to a region of __________ pressure.
Which of the following statements given below is correct ?
(i) In winter the winds flow from the land to the ocean.
(ii) In summer the winds flow from the land towards the ocean.
(iii) A cyclone is formed by a very high speed pressure system with very high speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.