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By XKCD
This small infographic shows the thickness of see ice up against famous city skylines. Notice how much bigger the ice sheets are than the cities!
Grade Level   4 5 6 7 8 9 10 11 12
Image Collections Teaching Media
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2
Rock Cycle is an interactive Web site where students can learn all about rocks and geology, the science of rocks. They will learn how rocks can be identified, how they are formed, and how they change over time. Students will identify the three major kinds of rocks and learn how to tell them apart....
Grade Level   5 6 7 8
Classroom Activities Curricula and Instruction
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