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"If your habits resemble those of average Americans, you generate about 4.6 pounds of solid trash per day. This adds up to big trouble for the environment. Americans are generating waste products faster than nature can break them down and using up resources faster than they can be replaced. How can we find ways to meet our current economic and social needs without compromising the ability of our children, and our children's children, to do the same? Our success will depend on understanding the difference between * Sustainable practices: practices that provide ongoing economic and social benefits without degrading the environment. * Unsustainable practices: "quick fixes" that fill an immediate need for resources. Over time, however, these practices deplete or damage natural resources so they cannot be used or enjoyed by future generations. In this exhibit, you can find out how to improve next year's environmental record. You'll learn how waste is handled now and how some communities are doing it better. In the activities, you can test your knowledge about hazardous waste we generate in our homes and try to shrink a landfill. "

" An interactive dictionary and thesaurus that leads you to discover the connections between vocabulary words in a visually captivating display. Word maps blossom with meaning, encouraging exploration instead of rote memorization to expand vocabulary. Vocabulary University Looking for the previous version of this website? Visit www.vocabularyuniversity.com. Cambridge Dictionaries Online Cambridge Advanced Learner's Dictionary and other excellent learner dictionaries are available online, free of charge. Online Etymological Dictionary A free and open resource for reliable information on word roots. Vintage Vocabulary A site highlighting American words and expressions with intriguing origins."

"Explore our library of 104 online activities that help to make math come alive in the classroom or at home View our collection of 579 lessons for preK-12 math educators Learn about NCTM's Principles and Standards for School Mathematics Check out hundreds of exemplary online resources, as identified by an editorial panel"

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Here is a list of all of the skills students learn in Algebra! The skills are organized into categories, and you can move your mouse over any skill name to see a sample question. To start practicing, just click on any link. IXL will track your score, and the questions will even increase in difficulty as you improve!