Whose Flotsom is This?
http://www.baylink.org/lessons/3fr_flotsom.html 

Until fairly recently, trash was just a noun. Your students know trash as a transitive verb also. To trash; to ruin a person, place or thing. This activity untrashes a park site, and contributes data to a national program which is a leader in the fight to stop global trashing. (Grades K-12)

• Location: BayLink - State Parks
• SOLs Covered: Science: K.1, K.16, 1.1, 1.15, 2.1, 2.13, 3.1, 3.2, 3.4, 4.1, 4.2, 5.1, 5.11; 6.2, 6.20, 6.21; 7.1, 7.5, 7.18; 8.1, 8.16, 8.17; 9.23. Social Studies: 3.3, 3.14, 3.15; 6.3, 6.5; 7.4, 7.9; 8.7, 8.8, 8.9, 8.10; 9.5, 9.6, 9.8, 9.9, 9.11; 11.2, 11.9
• Time Required: Time Required at the Park: 60-90 minutes, near low tide. 
• Dates: Time of Year: All seasons.
• Cost: