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1. Mud Fossils
   This activity calls for the students to observe real fossils
   http: //interactive2.usgs.gov/learningweb/teachers/...
   
   
2. Acid Rain Wordsearch Advanced
   Acid Rain Advanced Wordsearch download
   http: //epa.gov/acidrain/education/site_student...
   
   
3. Change and Cycles - Where Land, Air, and Water Meet
   To develop an understanding of parts per million as a concept, teams of students will create successive dilutions of a solution to reach a parts-per-million concentration.
   http: //interactive2.usgs.gov/learningweb/teachers/...
   
   
4. Impact Crater Module
   Impact Crater Module and Lessons
   http: //arizona.usgs.gov/Flagstaff/Outreach/CenterE...
   
   
5. Acid Rain Crossword Puzzle
   Acid Rain Crossword Puzzle download
   http: //epa.gov/acidrain/education/site_student...
   
   
6. Leaf Classification
   Leaf Classification Learning Activity
   http: //globe.gov/tctg/land_la_leafclass.pdf?se...
   
   
7. Mars Module
   Mars Module
   http: //arizona.usgs.gov/Flagstaff/Outreach/CenterE...
   
   
8. Time and Cycles
   In this activity straws will be used to simulate tree-ring core samples. Using the straws, students will work in groups to reconstruct a 50 year climatic history.
   http: //interactive2.usgs.gov/learningweb/teachers/...