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Torres, Sergio; Powers, Judith L. – Science Scope, 2009
In the exciting, "out of this world" activity described here, students measure the Earth using meter sticks while measuring their shadows in two distant locations. To obtain the size of the Earth, students discover the connection between the measurements of the shadows and a model of the spherical Earth following the method developed by…
Descriptors: Middle Schools, Geometric Concepts, Middle School Students, Models
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Gordon, Jessica – Science Scope, 2008
Water is an essential resource for all living things. How we live on our watershed can impact water quantity and quality. It is important to recognize how humans alter watershed dynamics, but students often find it challenging to visualize watershed processes and understand how decisions that they make as individuals and together as a community…
Descriptors: Water Quality, Conservation (Environment), Water Pollution, Science Instruction