National Science Olympiad (Soal OSN IPA SD) 2005 Theory 2

Below is a matter of National Science Olympiad For elementary school (Soal OSN IPA SD) used in the National Science Olympiad (OSN). The quetions consist problem solving OSN theory 1 , theory 2, and science experiment OSN 2005. You can download it by clicking on the word download in addition to the title the following exam in the second paragraf. You can use this problem to train your students to become the champion in the competition of national science olympiad. Good luck.

Wind is air in motion. It is produced by the uneven heating of the earth’s surface by the sun. Since the earth’s surface is made of various land and water formations, it absorbs the sun’s radiation unevenly. When the sun is shining during the day, the air over landmasses heats more quickly than the air over water. The warm air over the land expands and rises, and the heavier, cooler air over water moves in to take its place, creating local winds. At night, the winds are reversed because the air cools more rapidly over land than over water. Similarly, the large atmospheric winds that circle the earth are created because the surface air near the equator is warmed more by the sun than the air over the North and South Poles. 

Answer the following question! (sugestion: fill in the blank)
Wind is called a ....................... because wind ............................ as long as the sun shines on the earth.

In the surrounding area there are two kinds of coastal winds are onshore winds and sea breezes. Onshore wind is the wind that comes from the land to the sea while the sea breeze is a wind coming from the sea towards the land.
A) When is the onshore wind and the sea breeze? Explain why this is so!
B) What are the benefits of wind are land and sea breezes for fishermen?

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