Standards | Notes | Materials |
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Science |
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Social Studies |
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Technology |
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Math |
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First, thank you for considering this WebQuest. I hope it is all you expect it to be. If you have questions or suggestions, I would be glad to hear them. My email address is listed below. I believe this is an exciting and fun activity for middle school students. This activity covers a wide range of standards. It involves inquiry, open-ended investigations, collaboration, and many process skills. Either as an introduction and motivator or at the conclusion of this activity, show the movie Castaways. The solar still activity, Getting Fresh Water From Sea Water, is an excellent activity for teaching the scientific method. This activity works best when left set up all day long and the fresh water is collected first thing in the morning. You must pour water into the hole, especially if you live in a dry environment, like Saudi Arabia or Arizona. There isn't enough water in the soil to get good results. My students pour in a couple of liters or water. Give the water time to soak into the soil before covering, otherwise your beaker floats on the water. I haven't tried this, but I've heard of people putting plant material in the hole as a source of water. Before starting, have your students predict which color plastic will work best. The biggest problem with this experiment is that students don't seal the plastic to the ground by stacking dirt around the edges; the evaporating water escapes into the atmosphere. Often, they get too much dirt on the plastic surface and it collapses. Other common problems are not getting the collection container centered under the plastic, knocking the container over while putting the plastic on top, or not getting the hole deep enough and the plastic rests on top of the container. When all things work well, you can expect to get between 50 and 100 mL of fresh water per site. How many sites would you have to have in order to survive? For two people to survive? Have your students make a graphs of their results. Use a spreadsheet program to enter data and design graphs with the aid of the computer. It is important to repeat the experiment to see if you can duplicate the results and to work out all the bugs from the first experiment. How would increasing the surface area of the solar still effect the amount of fresh water produced? Have your students determine the relationship of the surface area to water produced and construct a spreadsheet to estimate water produced.
The Building a Shelter activity is interesting to do with middle school students. Most of my students have elected to build a model of a shelter; the shelters are usually made of sticks. However, they have done excellent PowerPoint presentations. This is a great activity for students that want to be engineers and students that like to build things. Challenge your students to include windows for ventilation. You may want to limit building materials to materials around your school. If you live in a rocky area, encourage your students to use rocks. If you live in a woody area, encourage your students to use sticks. How can you insulate the walls? Water proof the roof? How would you vary the construction if you marooned in a temperate zone? Alpine?
Finding Your Location is a challenging activity. Your students will need to construct a simple astrolabe using a soda straw, protractor, string, and a weight. Accurately reading the measurement of the angle of Polaris is the greatest problem, especially since this is done at home in the evening. Just locating Polaris may be a challenge. This may be an activity for your student's family to do together. Remember to use the compliment of the angle you measure with the protrator. The instructions on the worksheet are fairly clear for finding your latitude during the day time. The problem may be getting your students together when it is noon. This might be a good time to try cooperative learning. The NOVA program gives clear instructions for finding your longitude. The program explains the process then gives the student several examples to solve. All examples are based on knowing the time of sunrise. Have your students look up sunrise in your local papers and see if they can calculate their longitude using this method. Give your students some problems of your own. My students have had a little trouble with the mathematics involved in the process of calculating longitude when accounting for the time of year. Once you figure it out, you can explain that to your students. |
Fresh Water From Sea Water |
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Building a Shelter |
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Finding Your Location |
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Yanbu International School P. O. Box 30039 Yanbu Al Sinaiyah, Saudi Arabia Email: doninarabia@yahoo.com |