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Built-in technological know-how textbook.

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4. Continue to add drops until the piece of paper towel no longer can absorb the water. 5. Tally your observations in your data table and graph your results. 6. Repeat steps 2 through 5 three more times. Analysis 1. Did all the squares of paper towels absorb equal amounts of water? 2. If one brand of paper towel absorbs more water than the others, can you conclude that it is the towel you should buy? Explain. 3. Which scientific methods did you use to compare paper towel absorbency? Figure 13 Charts and graphs can help you organize and analyze your data.

The 1986 Safe Drinking Water Act is a law to ensure that drinking water in the United States is safe. The 1987 Clean Water Act gives money to the states for building sewage- and wastewater-treatment facilities. Find information about a state or local water quality law and share your findings with the class. SECTION 2 Doing Science 15 (l)Icon Images, (r)F. Fernandes/Washington Stock Photo Equipment, Materials, and Models When a scientific problem is solved by descriptive research, the equipment and materials used to carry out the investigation and analyze the data are important.

Combine your data with those of other students and plot the combined data on a map to recognize patterns in internet traffic. com/internet_lab LAB 29 Dominic Oldershaw The Everglades: River of Grass by Marjory Stoneman Douglas In this passage, Douglas writes about Lake Okeechobee, the large freshwater lake that lies in the southern part of Florida, north of the Everglades. A dike is an earthen wall usually built to protect against floods. Something had to be done about the control of Okeechobee waters in storms.

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