درباره جزر و مد ، جریان های اقیانوس و امواج بدانید

Find 1500+ education videos available at http://www.youtube.com/user/IkenEdu Water is an important part of our life. The biggest source of water is Ocean. There are a lot of things we can see in an ocean. Human designed so many machines that can measure the depth and life witshare this with your friends!

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