How Much of the Earth is Ocean?

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Presentation transcript:

How Much of the Earth is Ocean? Altadena Middle School 6th Grade Science

What % is Ocean? Make a prediction – what percent of the Earth is covered by ocean? Using the grid you have been provided, you and your team must find the actual percent. You must be able to prove your answer. Each group member must write down their answer and how they got it on their own piece of paper.

Decide on a Strategy How will you decide how many squares will count as ocean? What if a square is only partially covered in ocean? Should you count the land masses instead? You must show all of your work on the back of the map grid.

Asia Africa Caribbean Sea Gulf of Mexico Arctic Ocean Atlantic Ocean Europe Arctic Ocean N. America Asia Atlantic Ocean Pacific Ocean Africa Indian Ocean Pacific Ocean S. America Australia Southern Ocean

x 75 Cross Multiply 230 =100 17,250 divided by 100= 172.5 cubic/cm of water 230 - 172.5 = 57.5 cubic cm of land area Now prove your answer by counting the whole, half, quarter land squares. What did you come up with? Should be at least five percent plus or minus of 57.5. Show your work on the back of the grid.

Analysis Questions 1a. Look at your data: Was your strategy a good way to estimate the % of the earth’s surface covered by water? Why or why not? 1b. How could you make a better estimate? 2. The water on earth can be found in many places, including lakes, rivers, icebergs, oceans, and even underground. Based on this activity, where do you think most of the water can be found on earth?