How Much of the Earth is Ocean?

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How Much of the Earth is Ocean?

• Altadena Middle School
• 6th Grade Science

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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.

3
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.

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(No Transcript)
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Caribbean Sea
Gulf of Mexico
Europe
Arctic Ocean
N. America
Asia
Atlantic Ocean
Pacific Ocean
Africa
Indian Ocean
Pacific Ocean
S. America
Australia
Southern Ocean
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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.
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Analysis Questions

• 1a. Look at your data Was your strategy a good
  way to estimate the of the earths 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?