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Curated OER
Lichens as Air Quality Indicators: A beginning lichen identification study (2003
Students use GPS and trees to explore lichens and air quality.
PBS
Pbs Mathline: Sand Babies (Pdf) [Pdf]
In this engaging instructional activity, students use a variety of measurement strategies in creating their own Sand Babies. Students explore standard and non-standard measurements, area, data collection and analysis, and graphing....