Help me with my earth science lab???????????????????????????????

Feb 23rd, 2015
KateS
Category:
Environmental Science
Price: $15 USD

Question description

Blue Planet Web Site Assignment:



You probably have been told or read in one of your science textbooks, the percentage of water to land on our planet.  But rather than tell you, you are going to do an experiment and calculate the percentage for yourself.


You will conduct this activity 3 times:

·You will need to know how to calculate percentages

·You will need to know how to calculate  averages (mean)

Web site to show you how to calculate percentage: http://www.mathsisfun.com/percentage.html

How to figure percentage:  Example:  Total Amount:  Water  18 times  Land  7 

  ( 18 ÷25)  X  100  =  71%  water

  Part 1: 20 pts   (7 ÷ 25) X  100  = 28% land

 Trial 1

 Total spot= 25

 Amount of  times spot landed

Percentage

Water

Land

Does this reflect the actual percentage of  water at Earth’s surface?

Explain why or why not.  Please answer with an explanation rather than just a yes or no.

Trial 2

Total spot counts  = 25

Amount of times spot landed

Percentage

Water

Land

Does this reflect the actual percentage of water at Earth’s surface?

Explain why or why not.  Please answer with an explanation rather than just a yes or no.

Trial 3

Total spot counts  = 25

Amount of times spot landed

Percentage

Water

Land

Does this reflect the actual percentage of water at Earth’s surface.

Explain why or why not.  Please answer with an explanation rather than just a yes or no.

Averages:

Website on how to do average: http://www.mathsisfun.com/mean.html

Video on how to do averages: http://viewpure.com/95h7qAkz5QY

Trial 1  Water percentage

76%

 Trial 1 Land Percentage

24%

Trial 2: Water Percentage

Trial 2 Land percentage

Trial 3:  Water

Percentage

Trial 3 Land Percentage

Average (Mean)

For Water 

Average (Mean) for  Land

Part B -  11 pts.

6 Questions :  Make sure you READ the paragraph at the start of the web site for that is where you find the answers for answers 2 -6. You do NOT need to guess!

1.The Earth is actually around 71% water and 29% land.  

a. Which came closest to the actual percentage, individual trial or averaging the three trials together?

  B.  Do you think if you ran ten trials do you think you would get even closer to the actual percentage? 

   C.  Why do you think this is?

2.True or False Question:  There are actions one person can take to make a difference in the health of the Blue Planet.

True  False

3.How much of Earth's surface is covered with water?

a.¾

b.½

c.¼

d.All of it

4.True or False Question. Earth is called the Blue Planet because there is so much water at its surface.

True  False

5. True or False Question. The difference between salt water and fresh water is that salt water contains more natural dissolved salts.

True  False

6.If all the water on Earth fit into a 30 gallon (114 liter) bathtub, the amount that is fresh water would fill slightly more than a:

a.Teaspoon

b. Teacup

c.Milk Jug

d. Bowl


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