Earths Waters Lab watersoftheea This lab adapted fro ht psww

Earth\'s Waters Lab watersoftheea This lab adapted fro ht ps//www.sea edulacader Purpose(s) of Lab: As you have learned, 71% the Earth is covered with water. The oceans are the most visible bodies of water on the planet, however the salt content prohibits consumption While there are many sources of fresh water such as caps, glaciers, river and the atmosphere, it is important to note that the availability of water for human consumption is limited to fresh surface water. In this will visualize the quantities of water in these different areas and calculate what percentage is available for human consumption. Materials: Labels for bottles Seven clear two-liter bottles Metric measuring cup Blue food coloring Metric dropper or medicine cup Water Procedure: 1) Add blue food coloring to about 4 liters of water 2) Label the bottles 1-7 3) Add the following volumes to each bottle a. In bottle 1, pour 2000 mL b. In bottle 2, pour 1944 mL In bottle 3, pour 56 mL d. In bottle 4, pour 46 mL e. In bottle 5, pour 8 mL In bottle 6, pour 1 mL g. In bottle 7, pour 0.2 mL 4) Complete the data table. 5) Create a graph of your results. 6) Summarize your results in a conclusion statement. 7) Answer the analysis questions.

Solution

The data table:

Results and Conclusion

1) So to summarize, from the data given above it is clear that of all the water available on earth, 97.2% of it is salt water and only 2.8% is fresh water and of this 2.8% fresh water 2.3% is locked up in the form of ice which is about 82.14% of the total fresh water available. About 0.4% fresh water is underground and about 0.05% surface fresh water such as ponds, lakes, rivers etc, and 0.01% in air and soil.

To conclude, the entire human population thrives on fresh water that is readily available, that is surface fresh water (0.05%) and underground water(0.4%), which contributes about 1.78% and 14.28% respectively of all the fresh water available on Earth.

2) Underground fresh water and surface fresh water are the two forms of water available for human consumption.

3) Only 0.45% of all Earth\'s water is available for human consumption.

4) Its really a wonder that the entire Earth\'s population including, humans plants and animals all thrive on this 0.45% of fresh water that is readily available.

Alalysis Questions

1) 52.5 gallon/person/day

2) a) In 1980 the population of Atlanta used about 117,232,500 gallons/day

2) b) In 2000 the population of Atlanta consumed 215,890,395 gallons/day

2) c) The deference in consumption is 98,657,895 gallons/day

3) As the natural fresh water supply source does not increase and the human population continue to do so, we are going to face water shortage and will have to explore alternative sources of water and conserve the use of existing water resources.

Few ways to tackle these problems would be to Reduce and Recycle the water we use, and now technologies are available such as desalination by reverse osmosis, distillation etc which can be employed to purify sea water and can be used for human consumption.

Bottles	Volume of water poured in bottle	Type of Water	Percentage of Earth\'s water supply	Equation used
1	2000	All of Earth\'s water	100
2	1944	Ocean (Salt water)	97.2	(1944/2000)*100
3	56	All fresh water	2.8	(56/2000)*100
4	46	Fresh water locked in ice	2.3	(46/2000)*100
5	8	Undergroung fresh water	0.4	(8/2000)*100
6	1	Surface fresh water	0.05	(1/2000)*100
7	0.2	Water in soil and air	0.01	(0.2/2000)*100